SAFFLORITE (Cobalt Iron Arsenide)
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)( Information )
SARTORITE (Lead Arsenic Sulfide)
SCAPOLITE (Sodium Calcium Aluminum Silicate Chloride Carbonate Sulfate)
SCHEELITE (Calcium Tungstate)( Information)
SCHMITTERITE (Uranyl Tellurite)
SCHORL (complex Sodium Iron Boro-Aluminum Silicate)
SCHROCKINGERITE (Hydrated Sodium Calcium Uranyl Sulfate Carbonate Fluoride)
SCOLECITE (Hydrated Calcium Aluminum Silicate)( Information )( zeolite group info )
SCORODITE (Hydrated Iron Arsenate)
SCORZALITE (Iron Magnesium Aluminum Phosphate Hydroxide)
SELENITE (alternate name for Gypsum)( Information )
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)
Siderite & Lazurite (Canada)
SILLIMANITE (Aluminum Silicate)
SILVER (Ag)
SINHALITE (Magnesium Aluminum Borate)
SKLODOWSKITE (Hydrated Magnesium Uranyl Silicate)
SKUTTERUDITE (Cobalt Arsenide)
SMITHSONITE (Zinc Carbonate)( Smithsonite Information )( Calcite Group Info )
SMOKY_QUARTZ (variety of Quartz- Silicon Oxide)(Information)
SODALITE (Sodium Aluminum Silicate Chloride)(Information)
SPANGOLITE (Hydrated Copper Aluminum Sulfate Chloride Hydroxide)
SPESSARTITE (Manganese Aluminum Silicate)
Spessartite Garnet, Cleavelandite and Black Schorl
SPHAEROCOBALTITE (Cobalt Carbonate)
SPHALERITE (Zinc Iron Sulfide)( Information ) ( Group Info )
SPHALERITE & FLUORITE
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)(Information)
STICHTITE (Hydrated Magnesium Chromium Carbonate Hydroxide)
STILBITE (Hydrated Calcium Aluminum Silicate)( Information )( Zeolite Group )
Stilbite & Flourapophyllite
STISHOVITE (Silicon Dioxide)
STRENGITE (Hydrated Iron Phosphate)
STRONTIANITE (Strontium Carbonate)
STURMANITE (Hydrated Calcium Iron Aluminum Manganese Sulfate Tetrahydroxoborate Hydroxide)
SUGILITE (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
SULFUR (S)
SUSANNITE (Lead Sulfate Carbonate Hydroxide)
SUSSEXITE (Manganese Borate Hydroxide)
SVANBERGITE (Strontium Aluminum Phosphate Sulfate Hydroxide)
SYLVANITE (Silver Gold Telluride)
SYLVITE (Potassium Chloride)
SYNCHYSITE (Calcium Cerium Lanthanum Neodymium Yttrium Carbonate Fluoride)