Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Granite

Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)

Orthoclase (Potassium) Feldspar in Quartz

KAlSi3O8 (Potassium Aluminum Silicate)

Schist

Schist (primarily mica-schist)

Rough Emerald/Green Beryl

Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium

N/A - Image does not contain a rock or mineral

Anthropogenic textile material

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Amethyst Quartz (Tumbled)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Quartzite

Quartzite (primarily SiO2)

Peridot (Olivine)

Olivine ((Mg,Fe)2SiO4)

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

Granite Gneiss with Garnet

Garnetiferous Gneiss

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide)

Jasper and Quartzite Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Milky Quartz

Silicon Dioxide (SiO2)

Epidote (Unakite-related)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Granite

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Rose Quartz

Silicon Dioxide with traces of Titanium, Iron, or Manganese (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Quartzite River Cobble

Quartzite (primarily SiO2)

Quartz

Silicon Dioxide (SiO₂)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Peridot

Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Diamond

Carbon (C), Native Element

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)