Rock Identifier

Category

Mineral And Metamorphic Rock

Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.

Learn about Mineral And Metamorphic Rock in the encyclopedia

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Eulysite

Hornfels

Metabasalt

Halite

Metagabbro

Metarhyolite

Cordierite Hornfels

Cordierite Hornfels

Dolomite

Gypsum

Calcite specimen (Calcite (calcium carbonate, CaCO₃), likely botryoidal or drusy calcite) — mineral

Calcite specimen

Calcite (calcium carbonate, CaCO₃), likely botryoidal or drusy calcite

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Mossy Rock (Mixed lithology rock with Bryophyta (moss)) — sedimentary

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Dark gray slate (possibly argillite or shale) (Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals) — metamorphic

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Jade (Nephrite or Jadeite) (Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)) — Metamorphic Rock / Mineral

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Metamorphic Rock / Mineral

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Agate (Agate (a cryptocrystalline variety of Quartz, SiO₂)) — Mineral

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Fossilized bivalve shell fragment (Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image) — fossil

Fossilized bivalve shell fragment

Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image

Kidney Stone (Calcium Oxalate (CaC2O4·nH2O)) — mineral

Kidney Stone

Calcium Oxalate (CaC2O4·nH2O)

Schist with Biotite Inclusion (Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)) — metamorphic

Schist with Biotite Inclusion

Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Green Kyanite (Kyanite (Al2SiO5)) — mineral

Green Kyanite

Kyanite (Al2SiO5)

Yellow Agate (Banded Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Agate (Banded Chalcedony)

Silicon Dioxide (SiO2)

Black Spinel (Magnesium Aluminum Oxide (MgAl2O4)) — mineral

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Rough Diamond (or Quartz Crystal) (Carbon (C) [if Diamond] / Silicon Dioxide (SiO2) [if Quartz]) — mineral

Rough Diamond (or Quartz Crystal)

Carbon (C) [if Diamond] / Silicon Dioxide (SiO2) [if Quartz]

Rock salt (Halite) (Halite (Sodium Chloride, NaCl)) — sedimentary

Rock salt (Halite)

Halite (Sodium Chloride, NaCl)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Diamond (Diamond (pure Carbon, C)) — mineral

Diamond

Diamond (pure Carbon, C)

Greenschist (Greenschist (Chlorite-actinolite schist)) — metamorphic

Greenschist

Greenschist (Chlorite-actinolite schist)

Mixed rounded stream pebbles (Most appear to be granitic and mafic igneous rocks, including granite, gneiss, basalt, and possibly quartzite; exact identification is uncertain from the image.) — igneous

Mixed rounded stream pebbles

Most appear to be granitic and mafic igneous rocks, including granite, gneiss, basalt, and possibly quartzite; exact identification is uncertain from the image.

Quartzite (Quartz-rich metamorphic rock; chiefly SiO₂) — metamorphic

Quartzite

Quartz-rich metamorphic rock; chiefly SiO₂

Quartzite Pebble (with Quartz Vein) (Meta-quartzite (SiO2-dominated metamorphic rock)) — metamorphic

Quartzite Pebble (with Quartz Vein)

Meta-quartzite (SiO2-dominated metamorphic rock)

River Pebble (Gneiss or Quartzite variant) (Metamorphic rock specimen (likely Quartzite or Gneiss)) — metamorphic

River Pebble (Gneiss or Quartzite variant)

Metamorphic rock specimen (likely Quartzite or Gneiss)

Quartzite (River-worn) (Metamorphic rock predominantly composed of Quartz (SiO2)) — metamorphic

Quartzite (River-worn)

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartzite (Metamorphic rock primarily composed of Quartz (SiO2)) — metamorphic

Quartzite

Metamorphic rock primarily composed of Quartz (SiO2)

Quartzite (Metamorphic Rock consisting chiefly of Quartz (SiO2)) — metamorphic

Quartzite

Metamorphic Rock consisting chiefly of Quartz (SiO2)

Quartzite (Iron-stained River Rock) (Metamorphic Rock consisting primarily of Quartz (SiO2)) — metamorphic

Quartzite (Iron-stained River Rock)

Metamorphic Rock consisting primarily of Quartz (SiO2)

Red Quartzite (Metamorphic Rock (rich in SiO2 with hematite inclusions)) — metamorphic

Red Quartzite

Metamorphic Rock (rich in SiO2 with hematite inclusions)

Red Quartzite River Stone (Metamorphic Rock (composed mainly of Quartz, SiO2)) — metamorphic

Red Quartzite River Stone

Metamorphic Rock (composed mainly of Quartz, SiO2)

Slate (Slate (Low-grade foliated metamorphic rock)) — metamorphic

Slate

Slate (Low-grade foliated metamorphic rock)

Yellow Quartzite Pebble (Metamorphic rock predominantly composed of Quartz (SiO2)) — metamorphic

Yellow Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Anthracite Coal (Anthracite (Carbon-based sedimentary-metamorphic rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-based sedimentary-metamorphic rock)

River Rock (likely Gneiss or Quartzite) (Metamorphic rock specimen (potentially Foliated Gneiss)) — metamorphic

River Rock (likely Gneiss or Quartzite)

Metamorphic rock specimen (potentially Foliated Gneiss)

Moonstone (Orthoclase / Feldspar (KAlSi3O8)) — gemstone

Moonstone

Orthoclase / Feldspar (KAlSi3O8)

Apatite (Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))) — mineral

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Petrified Wood (Silicified Wood (mainly Quartz / SiO2)) — fossil

Petrified Wood

Silicified Wood (mainly Quartz / SiO2)

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Garnet in Matrix (Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix) — metamorphic

Garnet in Matrix

Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix

Quartz with inclusions (SiO2) — mineral

Quartz with inclusions

SiO2

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Quartzite Pebble (Metamorphic Quartz (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartz (SiO2)

Quartzite (Metamorphic Quartz Sandstone) — metamorphic

Quartzite

Metamorphic Quartz Sandstone