Anthropogenic (Man Made Industrial Deposit)

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Chert (or Flint)

Silicon dioxide (SiO2)

Red Sandstone

Arenite (Fe2O3 rich)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Greywacke

Dirty Sandstone (Lithic wacke)

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Sandstone (likely Quartzose Sandstone)

Arenite

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Sandstone

Arenite

Banded Iron Formation

Banded Iron Formation (BIF)

Quartzite Pebble

Quartzite (SiO2)

Agate

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Quartz (River-worn Pebble)

Quartz (SiO2)

Quartz

Quartz (SiO₂)

Dolomite

Dolomite (CaMg(CO3)2)

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Quartzite

Quartzite (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Fancy Jasper (Ocean Jasper or River Jasper variant)

Silicon Dioxide with inclusions (SiO2)

Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)

Quartz (SiO₂)

Pyrite

Pyrite (Iron Disulfide), FeS2

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Sandstone

Arenite (general term for sandstone)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Pyrite

Iron Sulfide (FeS2)

Chert (often referred to as Flint or Jasper when pigmented)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Onyx (Black) and Mother of Pearl Inlay

Silicon Dioxide (SiO2) for Onyx; Aragonite (CaCO3) for Mother of Pearl

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Gabbro

Gabbro (mafic intrusive igneous rock)

Chert (variations include Flint/Novaculite)

Chert (formula: SiO2)

Greywacke

Greywacke (Lithofeldspathic Sandstone)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Jasper (Iron-rich Chalcedony)

Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Quartz

Silicon Dioxide (SiO2)

Red Jasper (possibly Wonderstone)

Silicon Dioxide (SiO2) with iron oxide inclusions