Metamorphic (Likely Gneiss Or Schist Based On Texture)

Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.

Learn about Metamorphic (Likely Gneiss Or Schist Based On Texture) in the encyclopedia

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Gneiss

Schist

Tourmaline Schist

Staurolite Schist

Graphite Schist

Paragonite Schist

Chlorite Schist

Hornblende Schist

Garnet Schist

Mica Schist

Talc Schist

Biotite Schist

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

mineral

Fuchsite Gneiss or Schist

Muscovite (variety Fuchsite) within Metamorphic Host Rock

metamorphic

Staurolite

Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)

mineral

Granite or granitic gneiss pebble

Felsic granitoid, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

igneous

Staurolite

Staurolite (Fe2+2Al9Si4O23(OH))

metamorphic

Banded Gneiss

Metamorphic Gneiss

metamorphic

Black Kyanite

Kyanite (Al2SiO5) with carbonaceous inclusions

mineral

Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

gemstone

Rough Garnet (likely Almandine or Pyrope)

Garnet group; Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3

mineral

Schist

Mica Schist (Metamorphic Rock)

metamorphic

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

mineral

Given the appearance, it's likely a fragment of an igneous or metamorphic rock composed of multiple minerals. Without specific diagnostic features, it's difficult to give a common name other than 'crystalline rock fragment'. If pressed to guess based on the granular, somewhat light and dark speckled appearance, it could be a fragment of granite or a related intrusive igneous rock.

As a rock fragment, it does not have a single scientific mineral name; rather, it's a piece of a rock which is a combination of minerals. If it were granite, its main mineral composition would be quartz (SiO2), feldspar (e.g., KAlSi3O8 - orthoclase, (Na,Ca)(Al,Si)4O8 - plagioclase), and mica (e.g., KAl2(AlSi3O10)(OH)2 - muscovite or K(Mg,Fe)3AlSi3O10(OH)2 - biotite), among others.

Mineral, possibly rock fragment containing a mineral