Rock Identifier

Category

Sedimentary Or Metamorphic (Base Substrate)

Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.

Learn about Sedimentary Or Metamorphic (Base Substrate) in the encyclopedia

Sard

White Obsidian

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Metabasalt

Eulysite

Breccia

Hornfels

Ironstone

Anthracite

Metaquartzite

Slate

Red Jasper (Jasper (Silicon Dioxide Si₂O₃)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide Si₂O₃)

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

Epidote

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

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

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (Metamorphic Rock)

Dark gray rounded river pebble (Likely basalt or fine-grained volcanic rock; exact identification requires testing) — igneous

Dark gray rounded river pebble

Likely basalt or fine-grained volcanic rock; exact identification requires testing

Natural freshwater pearls (Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)) — gemstone

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Quartz Pebble (Silicon dioxide (SiO2)) — mineral

Quartz Pebble

Silicon dioxide (SiO2)

Granite Pebble (Granitoid (Felsic Plutonic Rock)) — igneous

Granite Pebble

Granitoid (Felsic Plutonic Rock)

Quartz-rich druse specimen (Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor feldspar or mica) — mineral

Quartz-rich druse specimen

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor feldspar or mica

Blue Kyanite in Schist (Al2SiO5 in Mica Schist) — metamorphic

Blue Kyanite in Schist

Al2SiO5 in Mica Schist

Weathered foliated metamorphic rock, likely schist or gneiss (Mica schist to gneiss; commonly quartz + feldspar + biotite/muscovite) — metamorphic

Weathered foliated metamorphic rock, likely schist or gneiss

Mica schist to gneiss; commonly quartz + feldspar + biotite/muscovite

Greenschist (Chlorite Schist) — metamorphic

Greenschist

Chlorite Schist

Gneiss (with Granite/Pegmatite Vein) (Foliated Metamorphic Rock (Quartz-Feldspar Gneiss)) — metamorphic

Gneiss (with Granite/Pegmatite Vein)

Foliated Metamorphic Rock (Quartz-Feldspar Gneiss)

Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss) (Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)) — metamorphic

Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)

Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)

Pyrite-bearing metamorphic rock (likely schist or quartzite) (Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)) — metamorphic

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Green Aventurine (Silicon dioxide (SiO2) with fuchsite inclusions) — mineral

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Chondrite Meteorite (Ordinary Chondrite (L or H type)) — igneous

Chondrite Meteorite

Ordinary Chondrite (L or H type)

Sandstone (Arkose) (Arkose Sandstone (principally SiO2 with Feldspar)) — sedimentary

Sandstone (Arkose)

Arkose Sandstone (principally SiO2 with Feldspar)

Jasper (Red and Yellow) (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Jasper (Red and Yellow)

Silicon Dioxide (SiO2) with iron oxide impurities

Milky Quartz with Iron Inclusions (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Gneiss (Granitic Gneiss) — metamorphic

Gneiss

Granitic Gneiss

Blue Kyanite (Kyanite (Al2SiO5)) — mineral

Blue Kyanite

Kyanite (Al2SiO5)

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

Gneiss

High-grade metamorphic rock (Gneiss)

Gneiss (Gneiss (foliated metamorphic rock)) — metamorphic

Gneiss

Gneiss (foliated metamorphic rock)

Mica Schist (with Muscovite) (Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)) — metamorphic

Mica Schist (with Muscovite)

Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz Vein in Host Rock (Likely Slate or Shale) (Hydrothermal Quartz (SiO2) in Pelitic host rock) — metamorphic

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Red Jasper (Jasper (Silicon Dioxide, SiO2)) — mineral

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz Vein in Hematitic Siltstone (Hydrothermal Quartz (SiO2) in Ferriferous Matrix) — metamorphic

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Gneissic Granite (Granite Gneiss) — metamorphic

Gneissic Granite

Granite Gneiss

Granite Gneiss (Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)) — metamorphic

Granite Gneiss

Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)

Gneiss (Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)) — metamorphic

Gneiss

Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)

Graphite (Graphite (Carbon, C)) — metamorphic

Graphite

Graphite (Carbon, C)

Kyanite (within Quartz) (Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)) — metamorphic

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

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

Anthracite Coal

Anthracite (Carbon-based sedimentary-derived metamorphic rock)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Gneiss or Quartzite mixture) (Metamorphic rock (Commonly Gneissic)) — metamorphic

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Sandstone (with potentially metamorphic or basaltic bands) (Arenite / Lithic Wacke) — sedimentary

Sandstone (with potentially metamorphic or basaltic bands)

Arenite / Lithic Wacke

Fuchsite or Green Mica Schist (Muscovite variant (KAl2(AlSi3O10)(OH)2 with Cr)) — metamorphic

Fuchsite or Green Mica Schist

Muscovite variant (KAl2(AlSi3O10)(OH)2 with Cr)

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2