Metamorphic (Likely Gneiss Or Schist Based On Texture)

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

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2

metamorphic

Garnet

Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)

mineral

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

mineral

Corundum (Sapphire/Ruby in Matrix)

Aluminium oxide (Al2O3)

mineral

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

metamorphic

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

metamorphic

Garnet (Almandine/Pyrope variety)

Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)

mineral

Rough Sapphire

Corundum (Al2O3)

mineral

Slate

Slate (foliated metamorphic rock rich in quartz, sericite, and chlorite)

metamorphic

Black Kyanite

Kyanite (Al2SiO5) with carbonaceous inclusions

mineral

Banded Gneiss

Gneiss (variable mineral composition)

metamorphic

Mica Schist

Mica Schist (contains Muscovite/Biotite, Quartz)

metamorphic

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Metamorphic

Garnet (Almandine)

Almandine, Fe3Al2Si3O12

mineral

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

mineral

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

metamorphic

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

metamorphic

Iolite (Cordierite)

Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18

mineral

Red Garnet

Pyrope-Almandine series (Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3)

mineral

Gneiss (specifically a Granitic Gneiss)

Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)

metamorphic

Granitic Gneiss

Gneiss (containing Potassium Feldspar and Quartz)

metamorphic

Green Kyanite

Kyanite (Al2SiO5)

mineral

Schist

Mica Schist

metamorphic

Gneiss

High-grade metamorphic rock (Gneiss)

metamorphic

Garnet (specifically Almandine)

Almandine - Fe3Al2(SiO4)3

metamorphic

White Quartz

Quartz (SiO2)

Mineral

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

mineral

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

metamorphic

Rough Star Sapphire (Corundum)

Al2O3 (Aluminum Oxide)

mineral

Schist/Phyllite

Metamorphic Schist (Chlorite Schist variety)

metamorphic

White Sapphire

Corundum (Al2O3)

mineral

Blue Sapphire

Corundum (Al2O3)

mineral

Corundum

Corundum (Al2O3)

Mineral

Rough Garnet (likely Almandine or Pyrope)

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

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