Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.

Unakite (Epidote-Rich Granite)

Unakite (Granite consisting of Orthoclase, Quartz, and Epidote)

metamorphic

Unakite

Epidotized Granite

metamorphic

Unakite

Epidotized Granite

metamorphic

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

igneous

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

metamorphic

Sandstone (Ferruginous)

Arenite with Iron Oxides

sedimentary

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Igneous

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Mineral

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

mineral

Yellow Quartzite (Beach Pebble)

Quartzite (primarily SiO2)

metamorphic

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

mineral

Tufa (Limestone)

Calcareous Tufa (CaCO3)

sedimentary

Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

metamorphic

Shale or Slaty Mudstone

Argillaceous sedimentary rock

sedimentary

Eclogite garnet in matrix

Eclogite (Garnet-Omphacite rock)

metamorphic

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

mineral

Agate

Silicon Dioxide (SiO2) - Chalcedony variant

mineral

Mica Schist

Foliated Metamorphic Rock (rich in Muscovite or Biotite)

metamorphic

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

mineral

Granodiorite / Granite

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

igneous

Red Sandstone

Arenite (predominantly Quartz with Hematite cementation)

sedimentary

Quartz Vein in Host Rock (Pebble)

Quartz (SiO2) with sandstone or siltstone matrix

metamorphic/igneous transition

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mineral