Mineral, Often Found As A Rock (Metamorphic)

Browse mineral, often found as a rock (metamorphic) specimens identified by the Rock Identifier community.

Yellow Quartzite River Cobble

Meta-quartzite (SiO2 with iron oxide staining)

metamorphic

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

metamorphic

Yellow Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Quartzite

Quartzite (primarily SiO2)

Metamorphic

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

sedimentary

Wishing Stone

Greenschist or Basalt with Quartz/Calcite Vein

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

metamorphic

Quartz

Silicon Dioxide (SiO2)

mineral

Quartz

Quartz (SiO2, Silicon Dioxide)

Mineral

Slate with Red Sandstone Landscaping Rock

Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone

metamorphic and sedimentary

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)

mineral

Gneiss

Gneiss (High-grade metamorphic rock)

metamorphic

Rough Tanzanite

Zoisite (Ca2Al3(SiO4)3(OH))

mineral

Quartzite

Quartzite (SiO2)

metamorphic

Schist with Quartz Vein

Mica Schist with Crystalline Quartz (SiO2)

metamorphic

Quartz

Silicon Dioxide (SiO₂)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

mineral

Quartzite Pebble (River Rock)

Quartzite (mainly SiO2)

metamorphic

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Metamorphic Rock

Peridot

Olivine ((Mg,Fe)2SiO4)

Mineral

Sandstone

Arenite (SiO2 dominant)

sedimentary

Eclogite

Eclogite (composed primarily of Omphacite and Pyrope Garnet)

metamorphic

Jade (likely Jadeite)

Jadeite (a pyroxene mineral) or Nephrite (a variety of amphibole mineral)

Mineral

Lapis Lazuli

Lazurite-rich metamorphic rock (approx. Na6Ca2(Al6Si6O24)(S,SO4,Cl)1,2)

metamorphic

Chalcopyrite

Chalcopyrite (CuFeS2)

Mineral

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

metamorphic

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

igneous/metamorphic (hydrothermal)

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Metamorphic Rock

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

mineral

Serpentinite

Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

metamorphic

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

mineral

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