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

Obsidian

Obsidian (Amorphous volcanic glass)

Aventurine

Quartzite with inclusions (SiO2 containing Fuchsite chrome mica)

metamorphic

Granitic Pegmatite

Pegmatitic Granite

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Caribbean Calcite

Calcium Carbonate with Argonite (CaCO3)

Turquoise in Matrix

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

Pegmatite (Granite Pegmatite)

Intrusive Igneous Rock (Granite Pegmatite)

Basalt with Mineral Vein (Cobble)

Basalt (with likely Quartz/Calcite vein)

Igneous

Amethyst

Amethyst (SiO2 with iron impurities)

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Blue Tiger's Eye

Crocidolite in Quartz (altered)

White Opal (Common)

Hydrated Silica (SiO2·nH2O)

Jasper (likely Brecciated or Multi-colored)

Jasper (SiO2)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Black Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Chrysocolla

Hydrated copper silicates (Cu, Al)2H2Si2O5(OH)4·nH2O

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Bumble Bee Jasper

Volcanic Tuff (mixture of SiO2, CaCo3, S, and As2S3)

Diamond

Diamond (Carbon, C)

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Pegmatite

Coarse-grained Igneous Rock (Granitic Pegmatite)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Ironstone with Pyrite

Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)

Conglomerate (River Rock)

Clastic sedimentary rock (primarily SiO2)

Organic Gemstone (fossilized resin)

Amber

Succinite (specifically for Baltic amber); chemical formula approx. C10H16O

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Synthetic material (Not a natural rock/mineral)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Sandstone (Ferruginous)

Arenite (Fe-rich)

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Synthetic / Textile

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Milky Quartz

Silicon Dioxide (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)