Organic Gemstone (Not A Rock Or Mineral)

Kidney Stone

Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Amethyst Geode

Silicon Dioxide with impurities (SiO2)

Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chrysocolla (in Host Rock)

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Limonite-stained Chert

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Amber

Succinates (Fossilized Tree Resin)

Precious Opal

SiO2·nH2O (Hydrated Silicon Dioxide)

Quartz

Silicon Dioxide (SiO2)

Labradorite (Feldspar)

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

Garnet-bearing Schist

Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist

Malachite in Host Rock

Cu2CO3(OH)2

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Hydroxide impurities

White Quartz

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Rose Quartz

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

Turquoise in Matrix

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

Turquoise

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

Amber

Succinite (C10H16O)

Quartz Crystal

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silica / Silicon Dioxide), SiO2

Chert (Jasper)

Silicon Dioxide (SiO2)

Banded gneiss

Gneiss, chiefly quartz–feldspar–mica (variable composition)

Amber Dragonfly Brooch

Succinited (Baltic Amber)

Chert Nodule

Microcrystalline Quartz (SiO2)

Banded Agate (Lake Superior Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Opal / Common Opal

Hydrated Silicon Dioxide (SiO2·nH2O)

Petrified Wood

Silicified Wood (Quartzo-feldspathic fossil wood)

Quartz

Silicon Dioxide (SiO2)

Tumbled quartz-rich stone, possibly blue quartz or granite

Quartz (SiO₂), with probable feldspar and dark accessory minerals

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)