Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Clear Quartz Fragment

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Mica-rich Pegmatite

Pegmatite (rich in Muscovite and Biotite)

igneous

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Garnet

Almandine Garnet (Fe3Al2(SiO4)3)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Quartz (Milky/Crystalline)

Quartz (Silicon Dioxide, SiO2)

Gneiss

Bumble Bee Jasper

Calcite-bearing Volcanic Tuff (not a true Jasper)

sedimentary

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Riverstone (Quartzite/Granite Cobble)

Silicon Dioxide (SiO2) based Quartzite or Silicate-rich Granite

metamorphic or igneous

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Quartz

Silicon dioxide (SiO2)

Schist

Chlorite/Mica Schist

Ruby in Zoisite

Anyolite (Ruby in Zoisite)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Schist

Mica Schist

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz with Mica (Gneiss/Schist influence)

Silicon Dioxide (SiO2) with Phyllosilicates

igneous/metamorphic

Heliotrope (Bloodstone)

Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)

Granitic Gneiss

Gneiss (Polymetamorphic Granitic Gneiss)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide)

Moqui Marble

Ironstone Concretion (Goethite/Hematite)

sedimentary

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)