Igneous Or Sedimentary (Anthropogenic Modification)

Quartz (Milky or Yellowish)

Silicon Dioxide (SiO2)

Blue Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Clear Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Clear Quartz

Silicon Dioxide (SiO2)

Biotite Schist

Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Star

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

White Agate (Chalcedony)

Chalcedony (SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Greenschist

Greenschist facies metamorphic rock

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Magnetite (likely with weathered Limonite/Hematite)

Magnetite (Fe3O4) with iron oxide weathering

Blue Chalcedony

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gneiss

Gneiss

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Gneiss (Cobble)

Gneiss

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)