Rock Identifier

Category

Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.

Learn about Igneous, Sedimentary, Or Metamorphic (Mineral Based) in the encyclopedia

Carbonatite

Coal

Cordierite Hornfels

Cordierite Hornfels

Migmatite

Metabasalt

Eltyubyuite

Metagabbro

Calc-Silicate Rock

Calc-Silicate Rock

Paracelsian

Kokchetavite

Celsian

Hornblende Schist

Hornblende Schist

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Quartz with Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with Inclusions

Silicon Dioxide (SiO2)

Clear Quartz (Faceted Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Blue Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Quartz-rich rock, possibly milky quartz or quartzite (Quartz (SiO₂); if quartzite, recrystallized quartz sandstone) — metamorphic

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂); if quartzite, recrystallized quartz sandstone

Citrine (Crystalline Quartz (SiO2) with iron impurities) — mineral

Citrine

Crystalline Quartz (SiO2) with iron impurities

Tiger Carving (Banded Onyx or Calcite) (Banded Calcite (CaCO3)) — sedimentary

Tiger Carving (Banded Onyx or Calcite)

Banded Calcite (CaCO3)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Hypersthene (Enstatite (Hypersthene variety), (Mg,Fe)SiO3) — mineral

Hypersthene

Enstatite (Hypersthene variety), (Mg,Fe)SiO3

Rounded gray river cobble (Likely fine-grained sandstone, siltstone, or metamorphosed equivalent; exact identification requires a fresh surface and tests) — sedimentary

Rounded gray river cobble

Likely fine-grained sandstone, siltstone, or metamorphosed equivalent; exact identification requires a fresh surface and tests

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Biotite Mica (K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2) — Mineral

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Peach Aventurine (Silicon Dioxide (SiO2) with Hematite/Goethite inclusions) — mineral

Peach Aventurine

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Muscovite mica (Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂) — mineral

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Scoria (vesicular volcanic rock) (Scoria; basaltic to andesitic volcanic rock, chiefly plagioclase, pyroxene, and volcanic glass) — igneous

Scoria (vesicular volcanic rock)

Scoria; basaltic to andesitic volcanic rock, chiefly plagioclase, pyroxene, and volcanic glass

Sandstone (Ferruginous) (Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Dalmatian Jasper (Peralkaline Quartz-Feldspar Igneous Rock with Arfvedsonite) — igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Igneous Rock with Arfvedsonite

Sandstone (Sandstone (Silicon dioxide, SiO2 based)) — sedimentary

Sandstone

Sandstone (Silicon dioxide, SiO2 based)

Polished gray stone, likely quartzite or river-worn granite (Tentatively quartzite (mostly microcrystalline SiO₂); exact identification is uncertain from the photograph) — metamorphic

Polished gray stone, likely quartzite or river-worn granite

Tentatively quartzite (mostly microcrystalline SiO₂); exact identification is uncertain from the photograph

Copper-bearing volcanic breccia (Altered andesite or rhyolite breccia with secondary copper minerals, likely chrysocolla and/or malachite) — igneous

Copper-bearing volcanic breccia

Altered andesite or rhyolite breccia with secondary copper minerals, likely chrysocolla and/or malachite

Likely biotite-rich schist (Mica schist, likely biotite-rich; exact minerals cannot be confirmed from the photo) — metamorphic

Likely biotite-rich schist

Mica schist, likely biotite-rich; exact minerals cannot be confirmed from the photo

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Graphite (Graphite (C)) — mineral

Graphite

Graphite (C)

Gneiss (Metamorphic Rock) (Gneiss) — metamorphic

Gneiss (Metamorphic Rock)

Gneiss

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Galena (Lead Sulfide (PbS)) — mineral

Galena

Lead Sulfide (PbS)

Muscovite Mica (KAl2(AlSi3O10)(F,OH)2) — mineral

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Sandstone (Red Sandstone) (Arenite (SiO2 based with Fe2O3 staining)) — sedimentary

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

Fossilized Shark Tooth (Selachimorpha fossil) — fossil

Fossilized Shark Tooth

Selachimorpha fossil

Red Sandstone (Arenite (primarily SiO2 with Fe2O3)) — sedimentary

Red Sandstone

Arenite (primarily SiO2 with Fe2O3)

Biotite (Black Mica) (Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)) — mineral

Biotite (Black Mica)

Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)

Biotite Schist (Biotite-rich Schist) — metamorphic

Biotite Schist

Biotite-rich Schist

Biotite / Black Mica (K(Mg,Fe)3(AlSi3O10)(F,OH)2) — mineral

Biotite / Black Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Green Schist (Greenschist (Chlorite Schist)) — metamorphic

Green Schist

Greenschist (Chlorite Schist)