Metamorphic Mineral

Browse metamorphic mineral specimens identified by the Rock Identifier community.

Learn about Metamorphic Mineral in the encyclopedia

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Metagabbro

Metabasalt

Glauconite

Eulysite

Anthracite

Hutcheonite

Halite

Eltyubyuite

Metaquartzite

Slate

Sperrylite

Paracelsian

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

mineral

Banded gneiss (likely amphibolite-bearing gneiss)

Gneiss; quartz–feldspar–mica/amphibole aggregate

metamorphic

Polished rhodonite

Rhodonite, manganese inosilicate (MnSiO₃)

mineral

Magnetite or Magnetic Iron Ore

Magnetite (Fe3O4)

mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

mineral

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

metamorphic

Quartz (Yellow/Citrine Variety)

Silicon Dioxide (SiO2)

mineral

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

mineral

Magnetite / Lodestone

Magnetite (Fe3O4)

mineral

Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite inclusions)

mineral

Magnetite / Hematite mix

Magnetite (Fe3O4) and Hematite (Fe2O3)

mineral

Tiger's Eye

Silicon Dioxide (Quartz pseudomorph after crocidolite) - SiO2

mineral

Magnetite or Hematite Nodule

Iron Oxide (Fe3O4 or Fe2O3)

mineral

Massive White Quartz

Silicon Dioxide (SiO2)

mineral

Garnet

Pyrope or Almandine (X3Y2(SiO4)3)

mineral

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish

mineral

Aventurine

Aventurine Quartz (SiO2)

mineral

Calcite

Calcium Carbonate (CaCO3)

mineral

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Rutilated Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions

mineral

Pyrite

Iron Disulfide (FeS2)

mineral

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

metamorphic

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

mineral

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)

mineral

Gneiss

Foliated Metamorphic Rock

metamorphic

Gneiss

Gneiss (Foliated Metamorphic Rock)

metamorphic

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

gemstone

Pyrite Nodules / Weathered Pyrite

Iron Sulfide (FeS2)

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