Organic Gemstone (Not A Rock)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Obsidian

Volcanic Glass (Amorphous Silica)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Massive Quartz

Silicon Dioxide (SiO2)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Carnelian Agate

Silicon Dioxide (SiO2)

Quartz (likely Rose Quartz or Milky Quartz based on color)

Quartz (SiO2 - Silicon Dioxide)

Rough Dark Green Sapphire

Corundum (Al2O3)

Obsidian

Obsidian (Volcanic Glass, complex silicate)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Clear Quartz Crystal (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Obsidian

Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Turquoise in Matrix

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Baltic Amber (Butterscotch variety)

Succinite

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (C10H16O)

Quartz (specifically Quartzite or Massive Quartz)

Silicon Dioxide (SiO2)

Wood Jasper

Siliceous sedimentary rock (variety of Chert/Chalcedony)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Garnet-Bearing Gneiss

Almandine-Garnet Gneiss

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Granite (a plutonic igneous rock)

Mahogany Obsidian

Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Fossilized Tree Resin (Succinite); Approximate formula: C10H16O

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities

Carnelian

Carnelian (a variety of Chalcedony, SiO₂)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).