Sedimentary Or Igneous (Secondary Formation)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Garnet (Almandine/Pyrope variety)

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

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Biotite Mica

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

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Gneiss (specifically Banded Gneiss)

Gneiss

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Gneiss (Cobble)

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Quartz (Silicon Dioxide, SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss

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

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)

Silicon Dioxide (SiO2) or Mafic extrusive igneous rock

Diamond

Carbon (C)

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

Quartz (milky quartz variety)

Quartz (SiO₂)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Red Jasper

Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Cryptocrystalline Quartz (Agate/Chert)

Silicon dioxide (SiO2)

Rhyolite

Rhyolite (Extrusive Igneous Rock)