Gilsonite

  SAFFLORITE (Cobalt Iron Arsenide)
    SAINFELDITE (Hydrated Calcium Arsenate Hydroxide)
    SAL_AMMONIAC (Ammonium Chloride)
    SAMARSKITE (Yttrium Cerium Uranium Iron Niobium Tantalum Titanium Oxide)
    SANBORNITE (Barium Silicate)
    SANIDINE (Potasium Aluminum Silicate)
    SAPPHIRE (variety of Corundum- Aluminum Oxide)
    SARTORITE (Lead Arsenic Sulfide)
    SCAPOLITE (Sodium Calcium Aluminum Silicate Chloride Carbonate Sulfate)
    SCHEELITE (Calcium Tungstate)
    SCHMITTERITE (Uranyl Tellurite)
    SCHOLZITE (Hydrated Calcium Zinc Phosphate)
    SCHORL (complex Sodium Iron Boro-Aluminum Silicate)
    SCHROCKINGERITE (Hydrated Sodium Calcium Uranyl Sulfate Carbonate Fluoride)
    SCOLECITE (Hydrated Calcium Aluminum Silicate)
    SCORODITE (Hydrated Iron Arsenate)
    SCORZALITE (Iron Magnesium Aluminum Phosphate Hydroxide)
    SELENITE (alternate name for Gypsum)
    SELENIUM (Se)
    SEMSEYITE (Lead Antimony Sulfide)
    SENARMONTITE (Antimony Oxide)
    SERANDITE (Sodium Manganese Calcium Silicate Hydroxide)
    SERPENTINE (Iron Magnesium Nickel Silicate Hydroxide)
    SHATTUCKITE (Copper Silicate Hydroxide)
    SIDERITE (Iron Carbonate)
    SILICON (Si)
    SILLIMANITE (Aluminum Silicate)
    SILVER (Ag)
    SINHALITE (Magnesium Aluminum Borate)
    SJOGRENITE (Hydrated Magnesium Iron Carbonate Hydroxide)
    SKLODOWSKITE (Hydrated Magnesium Uranyl Silicate)
    SKUTTERUDITE (Cobalt Arsenide)
    SMITHSONITE (Zinc Carbonate)
    SMOKY_QUARTZ (variety of Quartz- Silicon Oxide)
    SODALITE (Sodium Aluminum Silicate Chloride)
    SPANGOLITE (Hydrated Copper Aluminum Sulfate Chloride Hydroxide)
    SPERRYLITE (Platinum Arsenide)
    SPESSARTINE (Manganese Aluminum Silicate)
    SPHAEROCOBALTITE (Cobalt Carbonate)
    SPHALERITE (Zinc Iron Sulfide)
    SPHENE (Calcium Titanium Silicate)
    SPINEL (Group)
    SPINEL (Magnesium Aluminum Oxide)
    SPODUMENE (Lithium Aluminum Silicate)
    STAUROLITE (Iron Magnesium Zinc Aluminum Silicate Hydroxide)
    STELLERITE (Hydrated Calcium Aluminum Silicate)
    STEPHANITE (Silver Antimony Sulfide)
    STIBARSEN (Antimony Arsenic)
    STIBICONITE (Antimony Oxide Hydroxide)
    STIBNITE (Antimony Sulfide)
    STICHTITE (Hydrated Magnesium Chromium Carbonate Hydroxide)
    STILBITE (Hydrated Calcium Aluminum Silicate)
    STISHOVITE (Silicon Dioxide)
    STRENGITE (Hydrated Iron Phosphate)
    STRONTIANITE (Strontium Carbonate)
    STRUNZITE (Calcium Zinc Arsenate Hydroxide)
    STURMANITE (Hydrated Calcium Iron Aluminum Manganese Sulfate Tetrahydroxoborate Hydroxide)
    SUGILITE (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
    SULFUR (S)
    SUOLUNITE (Hydrated Calcium Silicate Hydroxide)
    SUSANNITE (Lead Sulfate Carbonate Hydroxide)
    SUSSEXITE (Manganese Borate Hydroxide)
    SVANBERGITE (Strontium Aluminum Phosphate Sulfate Hydroxide)
    SYLVANITE (Silver Gold Telluride)
    SYLVITE (Potassium Chloride)
    SYMPLESITE (Hydrated Iron Arsenate)
    SYNCHYSITE (Calcium Cerium Lanthanum Neodymium Yttrium Carbonate Fluoride)

T

    TAAFFEITE (Beryllium Magnesium Aluminum Oxide)
    TAINIOLITE (Potassium Lithium Magnesium Silicate Fluoride)
    TALC (Magnesium Silicate Hydroxide)
    TANTALITE (Iron Manganese Tantalum Niobium Oxide)
    TANZANITE (gem variety of Zoisite)
    TARBUTTITE (Zinc Phosphate Hydroxide)
    TEALLITE (Lead Tin Sulfide)
    TEKTITES (Meteoric Silica Glass)
    TELLURIUM (Te)
    TENNANTITE (Copper Arsenic Sulfide)
    TEPHROITE (Manganese Silicate)
    TETRAHEDRITE (Copper Antimony Sulfide)
    THAUMASITE (Hydrated Calcium Silicon Carbonate Sulfate Hydroxide)
    THENARDITE (Sodium Sulfate)
    THOMSONITE (Hydrated Sodium Calcium Aluminum Silicate)
    THORITE (Thorium Uranium Silicate)
    THOROGUMMITE (Thorium Uranium Silicate Hydroxide)
    TIN (Sn)
    TINAKSITE (Titanium Sodium Potasium Silicate Hydroxide)
    TINCALCONITE (Hydrated Sodium Borate)
    TITANIUM (Ti)
    TITANITE (alternate name for Sphene)
    TOPAZ (Aluminum Silicate Fluoride Hydroxide)
    TOPAZOLITE (the yellow variety of Andradite Garnet)
    TORBERNITE (Hydrated Copper Uranyl Phosphate)
    TOURMALINE (Group)
    TREMOLITE (Calcium Magnesium Iron Silicate Hydroxide)
    TRIDYMITE (Silicon Dioxide)
    TRIPHYLITE (Lithium Iron Manganese Phosphate)
    TRONA (Hydrated Sodium Bicarbonate Carbonate)
    TSAVORITE (variety of Grossular garnet)
    TSUMCORITE (Hydrated Lead Zinc Iron Arsenate)
    TSUMEBITE (Lead Copper Phosphate Sulfate)
    TURQUOISE (Hydrated Copper Aluminum Phosphate)
    TYUYAMUNITE (Hydrated Calcium Uranyl Vanadate)