Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Pyrite

Iron Sulfide (FeS2)

Hematite (Tumbled)

Iron(III) oxide (Fe2O3)

Conglomerate

Clastic Sedimentary (Conglomerate)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Conglomerate

Conglomerate (clastic sedimentary rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (with Quartzite and Mica)

Gneiss

Dragon Stone

Ohko Stone (Argillaceous sedimentary rock)

Native Gold (in earring form)

Gold (Au)

Gneiss (specifically Banded Gneiss)

Gneiss

Gneiss (specifically Banded Gneiss)

Gneiss

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

Quartz with Mica (Schist/Pegmatite fragment)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

igneous/metamorphic

Milky Quartz

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Polymictic Conglomerate)

Quartzite

Quartzite (primarily composed of SiO O₂)

Sedimentary Rock

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Anthropogenic Sedimentary (Man-made)

Concrete

Hydrated Portland Cement Aggregate Composite

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Gneiss

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Siltstone

Siltstone (primarily SiO2 with Al2O3)

Quartz (specifically Milky/White Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Quartz

Quartz (Silicon Dioxide - SiO2)

Magnetite (Lodestone variety)

Magnetite (Iron(II,III) oxide, Fe3O4)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)