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

Quartzite with Chert inclusions (Metamorphosed Quartz-rich Rock (SiO2)) — metamorphic

Quartzite with Chert inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Emerald / Green Beryl (Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities) — mineral

Emerald / Green Beryl

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

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)

Likely biotite-rich mica schist (Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂), with possible quartz and feldspar) — metamorphic

Likely biotite-rich mica schist

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂), with possible quartz and feldspar

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Map Jasper (Picasso Stone) (Metamorphosed Calcium Carbonate (Crystalline Limestone or Marble with Silicate inclusions/impurities)) — metamorphic

Map Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Crystalline Limestone or Marble with Silicate inclusions/impurities)

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

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

Feldspathic Gneiss (High-grade Metamorphic Rock (Gneiss)) — metamorphic

Feldspathic Gneiss

High-grade Metamorphic Rock (Gneiss)

Mica Schist with Garnet (Almandine-Mica Schist) — metamorphic

Mica Schist with Garnet

Almandine-Mica Schist

Graphite (Graphite (Native Carbon, C)) — Mineral

Graphite

Graphite (Native Carbon, C)

Green Mica (Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2) — mineral

Green Mica

Fuchsinite or Muscovite, KAl2(AlSi3O10)(OH)2

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

Jasper (Red and Yellow)

Silicon Dioxide (SiO2) with iron oxide impurities

Pink Granite River Pebble (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Pink Granite River Pebble

Phaneritic Felsic Igneous Rock (Granite)

Unidentified small white mineral fragment, possibly quartz (Unconfirmed; quartz (SiO₂) is a plausible visual match) — mineral

Unidentified small white mineral fragment, possibly quartz

Unconfirmed; quartz (SiO₂) is a plausible visual match

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

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Mica Schist with Quartz (Mica-Quartz Schist (Muscovite subclass)) — metamorphic

Mica Schist with Quartz

Mica-Quartz Schist (Muscovite subclass)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) — mineral

Epidote

Ca2(Al,Fe)3(SiO4)3(OH)

Mica-rich metamorphic rock (likely mica schist) (Mica schist, composed mainly of muscovite and/or biotite with quartz and possibly feldspar) — metamorphic

Mica-rich metamorphic rock (likely mica schist)

Mica schist, composed mainly of muscovite and/or biotite with quartz and possibly feldspar

Gneiss (Foliated Metamorphic Rock (Gneiss)) — metamorphic

Gneiss

Foliated Metamorphic Rock (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)

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Green Mica Schist (Mica Schist (Fuchsite or Chlorite variety)) — metamorphic

Green Mica Schist

Mica Schist (Fuchsite or Chlorite variety)

Dark metamorphic rock, likely slate or phyllite (Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage) — metamorphic

Dark metamorphic rock, likely slate or phyllite

Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage

Mica-bearing metamorphic rock with a dark mica crystal (Likely schist or mica-rich gneiss; dark crystal appears to be biotite, though identification from the photo is uncertain) — metamorphic

Mica-bearing metamorphic rock with a dark mica crystal

Likely schist or mica-rich gneiss; dark crystal appears to be biotite, though identification from the photo is uncertain

Milky quartz with iron staining (Quartz (SiO₂)) — mineral

Milky quartz with iron staining

Quartz (SiO₂)

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

Biotite Mica

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

Likely mica-rich schist fragment (Mica schist; exact mineral identification is uncertain from the image) — metamorphic

Likely mica-rich schist fragment

Mica schist; exact mineral identification is uncertain from the image

Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix) — Metamorphic or Igneous (context dependent)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Metamorphic or Igneous (context dependent)

Biotite Schist (Biotite Mica Schist [K(Mg,Fe)3AlSi3O10(OH,F)2]) — metamorphic

Biotite Schist

Biotite Mica Schist [K(Mg,Fe)3AlSi3O10(OH,F)2]

Muscovite Schist (Mica Schist (primarily KAl2(AlSi3O10)(OH)2)) — metamorphic

Muscovite Schist

Mica Schist (primarily KAl2(AlSi3O10)(OH)2)

Muscovite Mica Schist (Muscovite Schist (KAl2(AlSi3O10)(OH)2)) — metamorphic

Muscovite Mica Schist

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

Schist/Phyllite (Metamorphic Schist (Chlorite Schist variety)) — metamorphic

Schist/Phyllite

Metamorphic Schist (Chlorite Schist variety)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Schist (Mica Schist (Metamorphic Rock)) — metamorphic

Schist

Mica Schist (Metamorphic Rock)

Banded Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Pearl necklace (Pearl, primarily aragonite (CaCO₃) and conchiolin) — gemstone

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Green Kyanite (Kyanite (Al2SiO5)) — mineral

Green Kyanite

Kyanite (Al2SiO5)