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

Banded Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic Rock)

Likely biotite-rich schist (Mica schist, chiefly quartz and mica (commonly biotite; possible muscovite)) — metamorphic

Likely biotite-rich schist

Mica schist, chiefly quartz and mica (commonly biotite; possible muscovite)

Slate (Slate; predominantly fine-grained mica- and clay-mineral rock, commonly derived from shale) — metamorphic

Slate

Slate; predominantly fine-grained mica- and clay-mineral rock, commonly derived from shale

Kyanite (in Schist Matrix) (Kyanite (Al2SiO5)) — metamorphic

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

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

Gneiss (High-grade Metamorphic Rock)

Gneiss

Unidentifiable Rock Fragment — Uncertain

Unidentifiable Rock Fragment

Sandstone with Quartz Sphere (Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere) — sedimentary

Sandstone with Quartz Sphere

Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere

River Cobble (Phyllite or Quartzite) (Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)) — metamorphic

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Mica Schist (Mica Schist (Quartz-Mica Metamorphic Rock)) — metamorphic

Mica Schist

Mica Schist (Quartz-Mica Metamorphic Rock)

Biotite Schist (Schist (Biotite-dominated)) — metamorphic

Biotite Schist

Schist (Biotite-dominated)

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

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss (Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)

Yellow Agate (Agate (Varietal form of Chalcedony/Quartz, SiO2)) — mineral

Yellow Agate

Agate (Varietal form of Chalcedony/Quartz, SiO2)

Garnet in Schist (Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)) — metamorphic

Garnet in Schist

Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)

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

Biotite Mica

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

Quartzite (Quartzite; predominantly microcrystalline quartz (SiO₂)) — metamorphic

Quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂)

Pyrite-bearing rock (Likely pyrite (FeS₂), possibly with quartz or other sulfide minerals) — mineral

Pyrite-bearing rock

Likely pyrite (FeS₂), possibly with quartz or other sulfide minerals

Biotite mica schist (mica-rich metamorphic specimen) (Biotite-rich schist; chiefly phlogopite/biotite mica, commonly with quartz and feldspar) — metamorphic

Biotite mica schist (mica-rich metamorphic specimen)

Biotite-rich schist; chiefly phlogopite/biotite mica, commonly with quartz and feldspar

Greenschist (Chlorite Schist) — metamorphic

Greenschist

Chlorite Schist

Mica Schist with Quartz (Schist containing Muscovite and Quartz) — metamorphic

Mica Schist with Quartz

Schist containing Muscovite and Quartz

Graphite (Graphite (Carbon, C)) — mineral

Graphite

Graphite (Carbon, C)

Beach Pebbles and Quartz Aggregates (Quartz pebbles and biogenic fragments (SiO2, CaCO3)) — sedimentary

Beach Pebbles and Quartz Aggregates

Quartz pebbles and biogenic fragments (SiO2, CaCO3)

Mica Schist (Foliated Metamorphic Rock (Schist)) — metamorphic

Mica Schist

Foliated Metamorphic Rock (Schist)

Weathered brown river pebble, likely sandstone or iron-rich quartzite (Indeterminate; probable quartz-rich sandstone (quartz and iron-oxide cement)) — sedimentary

Weathered brown river pebble, likely sandstone or iron-rich quartzite

Indeterminate; probable quartz-rich sandstone (quartz and iron-oxide cement)

Mica Schist (Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)) — metamorphic

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

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

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

River Stone (likely Quartzite or Limestone) (Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)) — metamorphic

River Stone (likely Quartzite or Limestone)

Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)

Mixed gemstone jewelry collection (Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline) — gemstone

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Banded gneiss or gneissic schist (Quartz–feldspar–mica gneiss; exact mineral proportions require testing) — metamorphic

Banded gneiss or gneissic schist

Quartz–feldspar–mica gneiss; exact mineral proportions require testing

Biotite Schist with Garnet (Garnet-Biotite Schist) — metamorphic

Biotite Schist with Garnet

Garnet-Biotite Schist

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

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss (Granitic Gneiss) (Gneiss (from German Gneis, related to 'spark')) — metamorphic

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

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

Epidote

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

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

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Faceted clear gemstone, likely glass or cubic zirconia (Undetermined; could be synthetic cubic zirconia (ZrO₂) or cut glass (silica-based)) — gemstone

Faceted clear gemstone, likely glass or cubic zirconia

Undetermined; could be synthetic cubic zirconia (ZrO₂) or cut glass (silica-based)

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

Mica-rich schist (likely biotite schist)

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

Likely biotite-rich schist or gneiss (Mica schist (quartz–feldspar–biotite assemblage; exact identification requires examination)) — metamorphic

Likely biotite-rich schist or gneiss

Mica schist (quartz–feldspar–biotite assemblage; exact identification requires examination)

Mica Schist (Mica Schist) — metamorphic

Mica Schist

Mica Schist

Epidote with Magnetite/Hematite inclusions (Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides) — mineral

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

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

Biotite Schist

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