Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Chert Nodule)

Microcrystalline quartz (SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)

Milky Quartz (Ferruginous variety)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

igneous

Sandstone (Quartzose)

Arenite (primarily SiO2)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Mica Schist

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Citrine (likely Heat-Treated)

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Gneiss

Gneiss (High-grade metamorphic rock)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Anthracite

Anthracite (highest-grade coal)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Hematite

Iron(III) oxide (Fe2O3)

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Clear Quartz

Silicon dioxide (SiO2)

Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions

Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)

igneous/metamorphic

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

N/A (Non-Geological Object)

N/A

Orange Quartzite (Tumble-polished)

Quartzite (primarily SiO2)

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

igneous

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

igneous

Milky Quartz

Quartz (Silicon Dioxide, SiO2)