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)
TEKTITES (Meteoric Silica Glass)
TELLURIUM (Te)
TENNANTITE (Copper Arsenic Sulfide)
TETRAHEDRITE (Copper Antimony Sulfide)( Copper Family Info)
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)
TINCALCONITE (Hydrated Sodium Borate)
TITANITE (alternate name for Sphene)
TOPAZ (Aluminum Silicate Fluoride Hydroxide)
TORBERNITE (Hydrated Copper Uranyl Phosphate)
TOURMALINE ( Tourmaline Information & Links.)
TOURMALINE Indicolite in Quartz ( Quartz Information & Links.)
TOURMALINE (Green in Quartz)
TOURMALINE ( Shoral & Quartz )
TREMOLITE (Calcium Magnesium Iron Silicate Hydroxide)
TRIDYMITE (Silicon Dioxide)
TRIPHYLITE (Lithium Iron Manganese Phosphate)
TRONA (Hydrated Sodium Bicarbonate Carbonate)
TSAVORITE (variety of Grossular garnet)
TSUMEBITE (Lead Copper Phosphate Sulfate)
TURQUOISE (Hydrated Copper Aluminum Phosphate)( Turquoise Info )
TYUYAMUNITE (Hydrated Calcium Uranyl Vanadate)