Rock Identifier

Category

Igneous, Sedimentary, Metamorphic, Mineral

Browse igneous, sedimentary, metamorphic, mineral specimens identified by the Rock Identifier community.

Learn about Igneous, Sedimentary, Metamorphic, Mineral in the encyclopedia

Carbonatite

Coal

Conglomerate

Metabasalt

Cordierite Hornfels

Cordierite Hornfels

Glauconite

Quartzite Sandstone

Quartzite Sandstone

Eulysite

Migmatite

Breccia

Anthracite

Hutcheonite

Gneiss (Metamorphic rock of high-grade regional metamorphism) — metamorphic

Gneiss

Metamorphic rock of high-grade regional metamorphism

Dark gray volcanic rock, probably andesite or basalt (Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite) — igneous

Dark gray volcanic rock, probably andesite or basalt

Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite

Banded Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz-rich mineral fragment (Quartz (silicon dioxide, SiO₂), possibly milky quartz) — mineral

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz Pebble (Crystalline Silica (SiO2)) — sedimentary

Quartz Pebble

Crystalline Silica (SiO2)

Quartz (Quartz (SiO₂)) — Mineral

Quartz

Quartz (SiO₂)

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

Almandine Garnet (Iron aluminum silicate (Fe3Al2(SiO4)3)) — metamorphic

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Magnetite (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite

Iron(II,III) oxide (Fe3O4)

Bornite (Peacock Ore) (Bornite (Cu5FeS4)) — mineral

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Gneiss (High-grade foliated metamorphic rock) — metamorphic

Gneiss

High-grade foliated metamorphic rock

Biotite on Quartz (Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)) — mineral

Biotite on Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Biotite Mica Schist (Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2) — metamorphic

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Biotite Schist (Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)) — metamorphic

Biotite Schist

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

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz with Iron Stains (Quartz (SiO2) with iron oxide/hydroxide staining) — Mineral

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz crystal (Quartz (silicon dioxide, SiO₂), possibly milky quartz) — mineral

Quartz crystal

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Citrine (Silicon Dioxide (Quartz variety), SiO2) — mineral

Citrine

Silicon Dioxide (Quartz variety), SiO2

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Druzy Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Hematite (Iron Ore) (Hematite (Fe2O3)) — mineral

Hematite (Iron Ore)

Hematite (Fe2O3)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Sand / Sandstone grains (Silicon Dioxide (SiO2)) — sedimentary

Quartz Sand / Sandstone grains

Silicon Dioxide (SiO2)

Gneiss (with Quartz-Feldspar vein) (Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)) — metamorphic

Gneiss (with Quartz-Feldspar vein)

Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)

Garnet-Bearing Gneiss (Garnetiferous Feldspathic Gneiss) — metamorphic

Garnet-Bearing Gneiss

Garnetiferous Feldspathic Gneiss

Blue-gray quartz-bearing metamorphic rock (likely gneiss or schist) (Quartz–feldspar–mica rock; exact identification requires testing) — metamorphic

Blue-gray quartz-bearing metamorphic rock (likely gneiss or schist)

Quartz–feldspar–mica rock; exact identification requires testing

Pink Quartz (Silicon Dioxide (SiO2)) — mineral

Pink Quartz

Silicon Dioxide (SiO2)

Quartz with Epidote (Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))) — mineral

Quartz with Epidote

Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Likely biotite-bearing metamorphic rock (schist or gneiss) (Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica) — metamorphic

Likely biotite-bearing metamorphic rock (schist or gneiss)

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss with Quartz Vein (Gneiss containing Quartz (SiO2) filler) — metamorphic

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler