Mineral, Often Found In Metamorphic Rocks But Also In Sedimentary And Igneous Rocks

Browse mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks specimens identified by the Rock Identifier community.

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

mineral

Epidosite (Unakite-related)

Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))

metamorphic

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Greenstone

Greenschist

metamorphic

Quartz

Silicon Dioxide (SiO2)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Blue Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

mineral

Gneiss (Banded Gneiss)

Gneiss

metamorphic

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Sodalite

Sodalite: Na8(Al6Si6O24)Cl2

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

mineral

Sapphire

Corundum (Al2O3)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Kyanite

Kyanite (Al2SiO5)

mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

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

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

mineral

Yellow Quartz (Citrine or Citrine-colored Quartz)

Silicon Dioxide (SiO2)

mineral

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

metamorphic

Hematite (Iron Ore)

Hematite (Fe2O3)

mineral

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

mineral

Shale or Mudstone

Argillaceous sedimentary rock

sedimentary

Calcite

Calcium Carbonate (CaCO3)

mineral

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate, (Mg,Fe)2SiO4

Mineral

Bull Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Metamorphic