0TAAFFEITE (Beryllium Magnesium Aluminum Oxide)
0TAINIOLITE (Potassium Lithium Magnesium Silicate Fluoride)
0TALC (Magnesium Silicate Hydroxide)
0TANTALITE (Iron Manganese Tantalum Niobium Oxide)
0TANZANITE (gem variety of Zoisite)
0TARBUTTITE (Zinc Phosphate Hydroxide)
0TEALLITE (Lead Tin Sulfide)
0TEKTITES (Meteoric Silica Glass)
0TELLURIUM (Te)
0TENNANTITE (Copper Arsenic Sulfide)
0TEPHROITE (Manganese Silicate)
0TETRAHEDRITE (Copper Antimony Sulfide)
0THAUMASITE (Hydrated Calcium Silicon Carbonate Sulfate Hydroxide)
0THENARDITE (Sodium Sulfate)
0THOMSONITE (Hydrated Sodium Calcium Aluminum Silicate)
0THORITE (Thorium Uranium Silicate)
0THOROGUMMITE (Thorium Uranium Silicate Hydroxide)
0TIN (Sn)
0TINAKSITE (Titanium Sodium Potasium Silicate Hydroxide)
0TINCALCONITE (Hydrated Sodium Borate)
0TITANIUM (Ti)
0TITANITE (alternate name for Sphene)
Sale! 2TOPAZ (Aluminum Silicate Fluoride Hydroxide)
0TOPAZOLITE (the yellow variety of Andradite Garnet)
0TORBERNITE (Hydrated Copper Uranyl Phosphate)
*TOURMALINE (Group)
0TREMOLITE (Calcium Magnesium Iron Silicate Hydroxide)
0TRIDYMITE (Silicon Dioxide)
0TRIPHYLITE (Lithium Iron Manganese Phosphate)
0TRONA (Hydrated Sodium Bicarbonate Carbonate)
0TSAVORITE (variety of Grossular garnet)
0TSUMCORITE (Hydrated Lead Zinc Iron Arsenate)
0TSUMEBITE (Lead Copper Phosphate Sulfate)
0TURQUOISE (Hydrated Copper Aluminum Phosphate)
0TYUYAMUNITE (Hydrated Calcium Uranyl Vanadate)