Banded Calcite (often sold as 'Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Turquoise
Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/98a2a2f8-be01-4831-a944-de6fd3830399-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartzite
Quartzite (Silicon Dioxide: SiO2)
metamorphic
Amber
Succinite
Mineraloid
Iron Meteorite (Candidate)
Iron Meteorite (Siderite)
mineral
Iron Meteorite (Individual)
Siderite (composed of Kamacite and Taenite minerals)
igneous
Banded Calcite (Green Onyx)
Calcium Carbonate (CaCO3)
sedimentary
Green Calcite (often commercially called Green Onyx)
Calcium Carbonate (CaCO3)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite (or Milky Quartz pebble)
Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)
metamorphic
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Banded Calcite (often sold as Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2)
metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz Arenite (SiO2)
metamorphic
Iron Meteorite
Siderite (Iron-Nickel Meteorite)
meteorite
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)
igneous
Sphalerite with Galena
Zinc Sulfide ((Zn,Fe)S) and Lead Sulfide (PbS)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Geodal Limestone / Calcite Druze
Calcium Carbonate (CaCO3)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Ferric Iron Oxides
mineral
Red Granite
Felsic intrusive igneous rock (K-feldspar rich Granite)
igneous
Granite (Pink/Red variety)
Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Rough Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Quartzite
Quartzite (SiO2)
metamorphic