Rock Identifier

Category

Sedimentary Or Metamorphic (Low Grade)

Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.

Learn about Sedimentary Or Metamorphic (Low Grade) in the encyclopedia

Greenschist

Slate

Lignite

Calcilutite

Calcirudite

Grape Garnet

Grape Agate

Granulite

Chlorite Schist

Chlorite Schist

Turbidite

Conglomerate

Greenstone

Greenschist (Greenschist facies rock) — Metamorphic

Greenschist

Greenschist facies rock

Purple Slate (Foliated slate (Pelitic origin)) — metamorphic

Purple Slate

Foliated slate (Pelitic origin)

Glauconitic Sandstone (Glauconitic Sandstone (Greensand)) — sedimentary

Glauconitic Sandstone

Glauconitic Sandstone (Greensand)

Siltstone with Iron Staining (Siltstone (primarily SiO2 with Fe2O3 staining)) — sedimentary

Siltstone with Iron Staining

Siltstone (primarily SiO2 with Fe2O3 staining)

Siltstone (Siltstone) — sedimentary

Siltstone

Siltstone

Limonite stained Sandstone (Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)) — sedimentary

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Ruby (Corundum (Al2O3 with Chromium traces)) — mineral

Ruby

Corundum (Al2O3 with Chromium traces)

Tumbled ruby or ruby-bearing corundum (Corundum (Al₂O₃), red variety colored mainly by chromium) — gemstone

Tumbled ruby or ruby-bearing corundum

Corundum (Al₂O₃), red variety colored mainly by chromium

Ironstone Concretion (Ferruginous Concretion) — sedimentary

Ironstone Concretion

Ferruginous Concretion

Ironstone Concretion (Ironstone (Limonite/Goethite Concretion)) — sedimentary

Ironstone Concretion

Ironstone (Limonite/Goethite Concretion)

Ironstone Concretion (Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)) — sedimentary

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Limonite Concretion (Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)) — sedimentary

Limonite Concretion

Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

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

Mica Schist

Foliated Metamorphic Rock (Schist)

Nephrite Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)) — metamorphic

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Greenschist (Greenstone River Pebble) (Greenschist (Chlorite Schist)) — metamorphic

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Prehnite (Prehnite (Ca2Al2Si3O10(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Jadeite Jade (NaAlSi2O6 (Sodium Aluminum Silicate)) — metamorphic

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Prase quartz with actinolite inclusions (Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions) — mineral

Prase quartz with actinolite inclusions

Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions

Prehnite (Prehnite - Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Anthracite Coal (Anthracite (Carbon-rich metamorphic coal)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Fuchsite (Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)) — mineral

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)

Jasper (Silicon dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Serpentinite (Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)

Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

Aragonite (Flos Ferri) (Calcium Carbonate (CaCO3)) — mineral

Aragonite (Flos Ferri)

Calcium Carbonate (CaCO3)

Chert / Lake Superior Agate (Cryptocrystalline Silicon Dioxide (SiO2)) — sedimentary

Chert / Lake Superior Agate

Cryptocrystalline Silicon Dioxide (SiO2)

Engraved polished dark stone (likely slate or basalt) (Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing) — metamorphic

Engraved polished dark stone (likely slate or basalt)

Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing

Greenstone (Chert) (Microcrystalline Silica (SiO2) with chlorite/epidote inclusions) — metamorphic

Greenstone (Chert)

Microcrystalline Silica (SiO2) with chlorite/epidote inclusions

Anthracite Coal (Anthracite) — metamorphic

Anthracite Coal

Anthracite

Epidote with Quartz and Feldspar (Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)) — metamorphic

Epidote with Quartz and Feldspar

Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)

Greenstone Celt (Polished Stone Axe) (Metamorphosed mafic rock (often Basalt or Diabase)) — metamorphic

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Green Jasper / Metavesuvianite-bearing rock (Silica-rich microcrystalline quartz aggregate / Green Jasper) — igneous

Green Jasper / Metavesuvianite-bearing rock

Silica-rich microcrystalline quartz aggregate / Green Jasper

Jadeite (Jadeite (NaAlSi2O6)) — metamorphic

Jadeite

Jadeite (NaAlSi2O6)

Green Jasper (Microcrystalline Quartz (SiO2) with inclusions) — sedimentary

Green Jasper

Microcrystalline Quartz (SiO2) with inclusions

Greenstone (Greenschist / Greenstone (Epimetamorphic Rock)) — metamorphic

Greenstone

Greenschist / Greenstone (Epimetamorphic Rock)

Ruby (Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — mineral

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Serpentinite (Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Jadeite (Jade) (Jadeite; NaAlSi2O6) — metamorphic

Jadeite (Jade)

Jadeite; NaAlSi2O6

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Conglomerate (Conglomerate rock) — sedimentary

Conglomerate

Conglomerate rock

Schist (Mica Schist (primarily Muscovite and Biotite)) — metamorphic

Schist

Mica Schist (primarily Muscovite and Biotite)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)