Not A Geological Specimen

Browse not a geological specimen specimens identified by the Rock Identifier community.

Amethyst

Silicon Dioxide (SiO2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

mineral

Ferruginous Quartz

Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)

mineral

Basalt (Arrowhead form)

Extrusive mafic igneous rock

igneous

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral

Chert (Jasper variety)

Silicon Dioxide (SiO2)

sedimentary

River Pebble (Brecciated Chert/Siltstone)

Silicon Dioxide (SiO2) with mineral inclusions

sedimentary

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

mineral

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Honey Calcite

Calcium Carbonate (CaCO3)

mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

mineral

Ferruginous Breccia

Breccia with Iron-rich (Hematite/Goethite) Matrix

sedimentary

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Granite (Pink/Red variety)

Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)

igneous

Yellow Chalcedony

Silicon Dioxide (SiO2)

mineral

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

sedimentary

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Pyrite

Iron Disulfide (FeS2)

mineral

Chert (Jasper/Flint Pebble)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

sedimentary

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Nephrite (a form of Jade)

Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Mineral

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Jasper (Yellow/Brown variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Fossiliferous Brachiopod in Shale

Brachiopoda (Phylum) preserved in Carbonaceous Shale

sedimentary

Almandine Garnet

Almandine [Fe3Al2(SiO4)3]

mineral

Granite

Granite (Felsic Plutonic Rock)

igneous

Clear Quartz Cluster

Silicon Dioxide (SiO2)

mineral

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Gold (in Opaque Matrix/Jewelry)

Native Gold (Au)

mineral

Botryoidal Agate

Chalcedony (Silicon Dioxide, SiO2)

mineral

Pyrite (on Quartz matrix)

Iron Disulfide (FeS2)

mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Jasper

Silicon Dioxide (SiO2) with impurities

sedimentary

Amethyst

Amethyst (Silicon Dioxide, SiO2)

mineral

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

sedimentary

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

sedimentary