Saginite
Saginite is a type of chalcedony/agate with sage, plant, or other material that has become part of the stone. As with all agates it is good protective stone, and is very calming and soothing.It gives courage, energy, strength, and dispels fears, all of which increase self-confidence. Physically, agate helps with issues of the teeth and gums. It works with chakras according to stone color. Also see chalcedony and agate.
Salt (Halite, Sea Salt, and others)
Salt is a common mineral, and a very important one. It is found in many types... sea salt, halite, himalayan, volcanic, and others. Salt is used for flavoring foods, as most everyone knows. It is also a crucial part of life for us on this planet. Metaphysically, all salts are used for protection in general and protection from evil, especially protection of the home. Salt is used for purification and dispelling negativity in many magical and traditional rituals. It is also used for extending clairvoyance. Salts are used to release attachments, including emotional attachments. It has gentle but strong grounding and centering energies. Salt is a mineral that is said to bring abundance and a rich home life. Physically, salts are used in crystal healing for blood disorders, hypotension (low blood pressure), diarrhea, physical strength, intestines, and to stimulate the meridians. Salts are associated primarily with the root (base) chakra, though salts with different colors also are associated with the related color chakras. All types of salts are related to the Earth element. Sea salts are considered the best for purification, and are related to the Water element as well as Earth. Blue (indigo) halite is used in crystal healing for issues with the thymus, thyroid, and thalmus, as well as for mystical uses for psychic awareness and psychic communication. Pink halite rock salt is said to be excellent for both physical and emotional heart problems. Natural volcanic black salts (lava salts) are related to the Fire Element as well as Earth, and are used in spells and energy work for obtaining desires, manifestation, and releasing.
Sandalwood
Sandalwood is a sacred wood with a lovely aromatic scent. It is used extensively in modern times for incense, aromatherapy, carvings, malas (prayer beads), Ayurvedic medicine, perfumes, and essential oils, where it is said to bring one closer to the Divine. In ancient India, Egypt, Greece, and Rome it has been used for over 4000 years for purposes as diverse as building Hindu temples, and embalming. Sandalwood, as well as the modern uses. Sandalwood's scent is both excellent for staying present and alert during meditation, which makes it wonderful for ritual and spiritual practice. Its scent is said to transform desires, and also to bring emotional balance. In alternative healing, sandalwood is used in Ayurvedic medicine, and to treat anxiety, insomnia, neuralgia, sciatica, depression, urinary tract infections, coughs, nausea, dry skin, cardiac tonic, inflammations, fevers, antiseptic, dystentery, and stress-related disorders. Sandalwood is also used as an aphrodisiac.
Sapphire
Sapphire is a stone of creative expression, intuition, and meditation, and enhances all those things. Sapphire is corundum, and comes in virtually any color of the rainbow including blue, pink, purple, orange (Padparadsha), yellow, green, colorless, and red (known as ruby). Sapphire is beneficial for mental clarity and depression. Physically it is good for lowering fevers and inflammation, hearing problems, cancer, and burns. Sapphire is primarily associated with the brow chakra. Various colors of sapphire have properties in addition to the general sapphire properties.
Scapolite
Scapolite is known as a stone of problem solving and achievement. It is said to help find elegant solutions to problems, make changes in one's life, and bring inspiration and strength of purpose. Use scapolite mystically for bringing energies of breaking old patterns of sabotaging self and bringing acceptance of success. In this way, scapolite is a stone of success too. Spiritually, scapolite is said to bring peace of mind and calm debilitating emotions. Intuitives use scapolite on computers, TV's and other electronic equipment to absorb and negate EMF emissions. Folklore and spiritual healing says that scapolite is helpful for eyesight; mental clarity; glaucoma; cateracts; tension and pain in shoulders, neck, upper chest, and head; bone disorders; calcium assimilation; recovery from surgery; arthritis pain; and emotional chaos. Spiritual healers also use scapolite to draw out pain.
Scolecite
Scolecite is a stone of connections, patterns, and peace. It has energy for helping to see patterns of information, make connections, network, and collect patterns together. With this gentle but powerful energy, these things are brought to bear: growing and improving relationships; understanding, stabilizing and improving organizations and groups; networking with people. It can also assist with understanding the root of a problem or issue or challenge so that it can be worked with and overcome successfully. This energy can help take control of life so that what you want can be manifested. The peace energies of scolecite are far-reaching and can help one learn gentleness, inner peace, living from the heart with peace and lack of fear. Emotionally, scolecite has been used to decrease violence in thought, emotion, and behavior. Physically, scolecite has been used in crystal healing for circulation, blood clotting, clogged arteries, bruises, mental imbalances, eyes, lungs, intesting, misaligned spine, and removing parasites. Scolecite is associated with the third eye and crown chakras.
Selenite
Selenite is a stone of mental clarity, enhancing mental flexibility and strengthening decisions. It is also a sweet Angel stone, for angelic guidance. With it you can access past lives. It also promotes good business practices. It removes energy blocks from the physical and etheric bodies. Selenite is also a stone of love, partially for bringing the mental flexibility needed to maintain a loving relationship with ease. It also is said in crystal healing lore to remove blockages for healing, align the spine, good for the skeleton, and decrease epilepsy and seizures. It also has the ability to clear and enhance the energy of other stones that are placed on or near it. Selenite is associated with the crown chakra.
Septarian
Septarian is a geode that is a combination of yellow calcite, brown aragonite, grey limestone and white/clear barite, thus it has properties of each of its component minerals. Septarian is brings calming energies which have a nurturing feel to them, and can bring feelings of joy and spiritual uplifting. Septarian is used to enhance and nurture communication with groups, making it much easier to speak clearly and kindly in group settings.Septarian is also used to assist with communication with Mother Earth. It is said to bring unconscious foreknowledge needed by the user to help him or her always be prepared for what is coming up. In crystal healing folklore, Septarian is used for healing of the blood and kidneys. Septarian is related to the lower chakras, root, sacral and solar plexus.
Seraphinite (Serafinite, Serafina, Serefina Chlorite, Chlinochlore)
Seraphinite (serafina, chlinochlore) is often referred to an an angel stone because of its higher energies and relationship with angels. Seraphinite is said to help contact angels and communicate with them. Psychically, seraphinite is beneficial for intuition and psychic awareness. This stone can be very protective of the heart chakra when used over this chakra, and is helpful for sending unconditional love. Seraphinite is a purifying stone that helps one find one's higher purpose and will. Seraphinite is also extremely helpful for all forms of transformation and transmutation, including the magickal kind. Physically, seraphinite is healing for nerves, brain cells, purification of the blood and organs and eliminating toxins, kidneys, liver.
Serpentine
Serpentine, is a beneficial and versatile stone. It is said by mystics to help with emotional cleansing, psychic powers, and attract love and money. It is also used in the rise of the kundalini, facilitating the rise by opening a path that lessens discomfort. In addition, serpentine is considered a metaphysically protective stone that is especially protective against snakebite, poison, and venom. Serpentine is an excellent stone for meditation. Physically, traditional and mystical lore says that serpentine eliminates parasite infections, diabetes, removes venom and other poisons. Serpentine is associated primarily with the heart chakra.
Shattuckite
Shattuckite is often called a stone of reconciliation. It is reputed to have properties of assisting with reconcilation and renewal. Shattuckite is also used to channel information, particularly from extra-terrestrials; and it is used for automatic writing. It is said to calm the mind and create harmony. Crystal healing lore reputes that shattuckite is helpful for healing diabetes, calcium absorption problems, parathyroid, mites and other infestations, and tonsilitis. Shattuckite is primarily associated with the throat chakra.
Silicon
Silicon, the natural element Si, is the second most abundant element after Oxygen. It is usually found as a portion of something else, in much the same way oxygen is. Quartz crystal, is, in fact, SiO2! Silicon, when purified by man, is a pure element energy, and though "manmade" does have mystical energies, just as Silicon lends its energies to the minerals and other things it is a part of. My initial take on Silicon was that it had energies of enhanced communication, agility of thought, and grace. After more research and time with the element, I've discovered more about Silicon. Silicon is also used to enhance and sharpen mental activity and focus. It is also said to promote discrimination in the sense of being able to sort out the truth from a great deal of possibly conflicting information. When using Silicon, many have found that its energies promote and accentuate positive energies for all situations. Silicon is said to be a great healer, and by some is called a "Master Healer" stone. Physically it is said in crystal healing to help with headaches, eyestrain, as well as repetitive motion injury and other difficulties related to overuse of computers. It is also said to be a great vitality booster, and help strengthen bones and teeth. In crystal healing it is sometimes used to purify the body and mind, and is helpful for enhancing manual dexterity. It is also said to promote increased memory and possibly help with Alzheimer's disease and other dis-ease states that affect the memory negatively.
Silver
Silver is a mineral that is said to mirror the soul, strengthen the connection between astral and physical bodies, and enhance intuitive and psychic energies. Silver is mystically considered to improve speech, bring eloquence. It is also purported to attract, enhance and store the energies of gemstones, as well as draw out negative energies. Silver is related to the moon, and moon energies. Physically, crystal healing lore indicates that silver is has been traditionally used to aid heptatitis treatments, eliminate toxins, expel toxins through the pores, headache, rheumatic pain, nausea and gastritis, obesity, diabetes, and increase assimilation of vitamins A and E.
Smithsonite
Smithsonite is a stone of charm, kindness and positive happenings. It is auspicious for new beginnings. It can activate each chakra (energy center) of the body and can be used as a "replacement stone" in crystal healing. It reputedly helps with immune system problems, alcoholism, sinus problems and digestive ailments. It also helps attract new friends.
Sodalite
Sodalite is a stone of logic, rationality, and efficiency. It is helpful for work in groups and stimulates thought. Sodalite is a stone that is good for healing breaches in communication. It is a stone of truth, and brings this to all communications. It is called a Poet's Stone. It can help end arguments or other disagreements. It is particularly useful for honesty of emotions and love. It increases intelligence, knowledge and learning, and can unite the logical with the spiritual. Physically it is said in folklore and crystal healing to be beneficial for the glands, diabetes, digestive system, lymphatic cancer, relieving insomnia, and decreasing calcium deficiency. It is also used in crystal healing for quicker relief of head colds. Sodalite is associated with the throat and brow chakras.
Spinel
Spinel is a stone that comes in so many colors it's often confused for other stones. It's a valid mineral in its own right, though, and has many positive energetic properties. In metaphysical and crystal healing lore, spinel of virtually any color is known for the following energetic attributes. It is a stone that can bring high energy to all efforts and all realms. In the outer world, spinel is used to attract money, wealth and prosperity. It is also said to be a stone of immortality. Spinel is used in the mental realm for intellectual power and alleviating forgetfulness. Psychically, it is used for aura cleansing, astral travel, channeling, and clairaudience. Emotionally, spinel is used for alleviating stress and depression, bringing calm to those within its energy field. In the physical realm, it is used in folklore and crystal health to benefit teeth, spine, gums, whole body healing, cancer healing, slimming to a healthy weight, and increasing physical energy and stamina. It is related to particular chakras and color healing work according to its color, and is said in all colors to assist with raising kundalini energy.

Spirit Quartz (Porcupine Quartz, Cactus Quartz, Spirit Crystals) 
See link for details

 

Spodumene
Spodumene is a stone that is often used to clear negativity. It is also used to raise vibration levels. Spodumene is an excellent stone for meditation and can help achieve deep meditation. This crystal is said to bring a deep sense of peace when held or used. Spodumene is related primarily to the Crown Chakra. Different colors of spodumene have additional attributes, including Kunzite (pink spodumene) and Hiddenite (green spodumene). 
Also See Kunzite and Hiddenite.
Stichtite
Stichtite is a stone that brings emotional awareness and expansion. It is a very calming stone that brings tranquility and peace to individuals and to one's environment. It help one to be gentle with self and others, and promotes keeping promises, openly sharing opinions, and considering all thoughts with love. It engenders loving companionship of all kinds. For family life, stichtite can help children behave positively. Physically, stichtite helps heal teeth, gums, skin elasticity, skin regeneration, mucous membrane problems. Stichtite is associated with the heart chakra, which it helps the passage of kundalini through.
Stilbite
Stilbite is a powerful mineral. It helps with psychic knowing and intuition. It is also used for psychic direction and guidance from guides, guardian angels, and totem animals. Stilbite is also a powerful stone of creativity that enhances creative energy. It heightens many physical senses, particularly taste (but as Mr Volunteer Man reminds me, the stone itself should not be eaten!) Stilbite can also help with acceptance and letting go. It is also used for manifestation. Physically, stilbite is used to remove toxins, and for laryngitis. Stilbite is associated with the heart, crown, and throat chakras.
Sugilite (Sugalite, Royal Azel, Lavulite, Luvulite Cybeline, Wesselite)
Sugilite is sometimes known as "the healer's stone" because of its great ability to enhance healing. It is associated with the third eye and crown chakras. It lessens effects of shock and disappointment. In addition to its well known enhancement of crystal healing ability, it also strengthens spirituality, psychic ability and channelling. Sugilite is a stone that helps perfect spiritual love and open the heart chakra to unconditional love. It can help manifest one's natural gifts and protect against harsh realities. It lowers hostility, anger, jealousy and prejudice and gives a sense of freedom. Psychically, it is excellent for all kinds of psychic and spiritual protection. It has been used for headaches and to decrease all types of discomfort. Sugilite is associated with the brow chakra. It is also called Sugalite, Royal Azel, Lavulite, Luvulite Cybeline, or Wesselite.
Sulphur (Sulfur, Sulfer)
Sulphur is said in the crystal healing world to be a stone of energy and vitality which can help remove negative thoughts and feelings. Mystically, this is said to help decrease illness by taking away the mental/emotional component. The vitality properties of sulphur are said to bring protection and purification. It is used in metaphysics to purify and detoxify environments, thoughts, and even the energy fields of people. Traditional and mystical lore repute that sulphur is helpful for the skin, digestion, arthritis, recuperation, muscles, back-aches, feet, chemotherapy related discomforts and detoxification of substances or toxins. Sulphur is considered to be related primarily to the solar plexus chakra.
Sunstone
Sunstone is a powerful stone for dispelling fears and phobias of all kinds. It is also a leadership stone, and brings leadership qualities to its wearer. In addition to dispelling fears and phobias, sunstone also decreases stress and lifts depression. Sunstone also brings good luck and abundance, and turns negative energies and psychic attacks into positive energies. This stone increases personal power and will, as well as life force energy. Sunstone is also said to be helpful in contacting animal or spirit guides. Physically, sunstone is beneficial for general health, physical energy, sexual dysfunction, increasing sexual energy. Sunstone is associated with the sacral chakra.
Super Seven (Melody's Stone, Sacred Seven) 
Super Seven, also known as Melody's Stone or Sacred 7, is a very spiritual stone. It is one of the few stones that retain their energy and clarity and never needs cleansing or energizing. Also, a piece of Super Seven retains the properties of all the stones in the combination of amethyst, smoky quartz, clear quartz, rutile, goethite, lepidochrosite and cacoxenite, even if the piece does not visibly show all 7 minerals. Super Seven is excellent for enhancing all types of psychic abilities and psychic skills including telepathy, clairvoyance, clairaudience, channeling, telekinesis, and others. It is a powerful stone for crystal healing, and is excellent for healing mind, body, and spirit dis-ease. Super Seven is not associated with any one chakra, but is reportedly fantastic at healing, balancing and energizing all seven chakras.