0SAFFLORITE (Cobalt Iron Arsenide)
0SAINFELDITE (Hydrated Calcium Arsenate Hydroxide)
0SAL_AMMONIAC (Ammonium Chloride)
0SAMARSKITE (Yttrium Cerium Uranium Iron Niobium Tantalum Titanium Oxide)
0SANBORNITE (Barium Silicate)
0SANDSTONE (a common sedimentary rock)
1SANIDINE (Potasium Aluminum Silicate)
0SAPPHIRE (variety of Corundum- Aluminum Oxide)
0SARD (variety of Quartz - Silicon Oxide)
0SARDONYX (variety of Quartz - Silicon Oxide)
0SARTORITE (Lead Arsenic Sulfide)
0SCAPOLITE (Sodium Calcium Aluminum Silicate Chloride Carbonate Sulfate)
1SCHEELITE (Calcium Tungstate)
0SCHMITTERITE (Uranyl Tellurite)
0SCHOLZITE (Hydrated Calcium Zinc Phosphate)
0SCHORL (complex Sodium Iron Boro-Aluminum Silicate)
0SCHROCKINGERITE (Hydrated Sodium Calcium Uranyl Sulfate Carbonate Fluoride)
0SCOLECITE (Hydrated Calcium Aluminum Silicate)
0SCORODITE (Hydrated Iron Arsenate)
0SCORZALITE (Iron Magnesium Aluminum Phosphate Hydroxide)
0SEDIMENTARY (rocks formed via biochemical, clastic, or evaporative processes)
0SELENITE (alternate name for Gypsum)
0SELENIUM (Se)
0SEMSEYITE (Lead Antimony Sulfide)
0SENARMONTITE (Antimony Oxide)
0SERANDITE (Sodium Manganese Calcium Silicate Hydroxide)
1SERPENTINE (Iron Magnesium Nickel Silicate Hydroxide)
0SHATTUCKITE (Copper Silicate Hydroxide)
0SIDERITE (Iron Carbonate)
*SILICATES (Class)
0SILICON (Si)
0SILLIMANITE (Aluminum Silicate)
1SILVER (Ag)
0SINHALITE (Magnesium Aluminum Borate)
0SJOGRENITE (Hydrated Magnesium Iron Carbonate Hydroxide)
0SKLODOWSKITE (Hydrated Magnesium Uranyl Silicate)
0SKUTTERUDITE (Cobalt Arsenide)
Sale! 6SMITHSONITE (Zinc Carbonate)
2SMOKY_QUARTZ (variety of Quartz- Silicon Oxide)
0SODALITE (Sodium Aluminum Silicate Chloride)
0SPANGOLITE (Hydrated Copper Aluminum Sulfate Chloride Hydroxide)
0SPERRYLITE (Platinum Arsenide)
0SPESSARTINE (Manganese Aluminum Silicate)
0SPHAEROCOBALTITE (Cobalt Carbonate)
0SPHALERITE (Zinc Iron Sulfide)
0SPHENE (Calcium Titanium Silicate)
*SPINEL (Group)
0SPINEL (Magnesium Aluminum Oxide)
2SPODUMENE (Lithium Aluminum Silicate)
0STAUROLITE (Iron Magnesium Zinc Aluminum Silicate Hydroxide)
0STELLERITE (Hydrated Calcium Aluminum Silicate)
0STEPHANITE (Silver Antimony Sulfide)
0STIBARSEN (Antimony Arsenic)
0STIBICONITE (Antimony Oxide Hydroxide)
0STIBNITE (Antimony Sulfide)
0STICHTITE (Hydrated Magnesium Chromium Carbonate Hydroxide)
3STILBITE (Hydrated Calcium Aluminum Silicate)
0STISHOVITE (Silicon Dioxide)
0STRENGITE (Hydrated Iron Phosphate)
0STRONTIANITE (Strontium Carbonate)
0STRUNZITE (Calcium Zinc Arsenate Hydroxide)
0STURMANITE (Hydrated Calcium Iron Aluminum Manganese Sulfate Tetrahydroxoborate Hydroxide)
0SUGILITE (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
*SULFATES (Class)
*SULFIDES (Class)
0SULFUR (S)
0SUNSTONE (variety of Oligoclase, Sodium Calcium Aluminum Silicate)
0SUOLUNITE (Hydrated Calcium Silicate Hydroxide)
0SUSANNITE (Lead Sulfate Carbonate Hydroxide)
0SUSSEXITE (Manganese Borate Hydroxide)
0SVANBERGITE (Strontium Aluminum Phosphate Sulfate Hydroxide)
0SYLVANITE (Silver Gold Telluride)
0SYLVITE (Potassium Chloride)
0SYMPLESITE (Hydrated Iron Arsenate)
0SYNCHYSITE (Calcium Cerium Lanthanum Neodymium Yttrium Carbonate Fluoride)