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

Serpentine (Serpentinite) (Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)) — metamorphic

Serpentine (Serpentinite)

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)

Milky quartz fragment (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Anthracite Coal (Anthracite (Carbon rank)) — sedimentary

Anthracite Coal

Anthracite (Carbon rank)

Weathered greenstone pebble (Likely metabasalt (chlorite–actinolite-rich greenschist); exact identification requires close examination) — metamorphic

Weathered greenstone pebble

Likely metabasalt (chlorite–actinolite-rich greenschist); exact identification requires close examination

Serpentine (Serpentinite) (Serpentinite / Antigorite-Lizardite group (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine (Serpentinite)

Serpentinite / Antigorite-Lizardite group (Mg,Fe)3Si2O5(OH)4

Slate (Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz) — metamorphic

Slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Dark gray foliated metamorphic rock, likely slate or phyllite (Slate–phyllite; predominantly quartz, mica, and chlorite) — metamorphic

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate–phyllite; predominantly quartz, mica, and chlorite

Greenstone (Epidosite) (Epidosite (Metamorphosed Basalt/Diabase)) — metamorphic

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Greenstone (Epidote/Chlorite Rich Rock) (Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))) — metamorphic

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Greenstone (Greenschist / Meta-basalt) — metamorphic

Greenstone

Greenschist / Meta-basalt

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

Emerald / Green Beryl

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

Layered dark metamorphic rock, likely slate or phyllite (Slate/phyllite; predominantly fine-grained quartz, mica, and chlorite) — metamorphic

Layered dark metamorphic rock, likely slate or phyllite

Slate/phyllite; predominantly fine-grained quartz, mica, and chlorite

Slate with Fossiliferous Impressions (Metamorphosed Argillaceous Rock (Fossiliferous Slate)) — metamorphic

Slate with Fossiliferous Impressions

Metamorphosed Argillaceous Rock (Fossiliferous Slate)

Limonite/Goethite Iron Concretion (Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)) — mineral

Limonite/Goethite Iron Concretion

Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)

Pyrite-bearing dark slate or phyllite (Likely pyrite (FeS₂) disseminated in fine-grained slate/phyllite; exact host rock cannot be confirmed from the photo) — metamorphic

Pyrite-bearing dark slate or phyllite

Likely pyrite (FeS₂) disseminated in fine-grained slate/phyllite; exact host rock cannot be confirmed from the photo

Slate (Slate; fine-grained foliated metamorphic rock, chiefly quartz, mica, and clay minerals) — metamorphic

Slate

Slate; fine-grained foliated metamorphic rock, chiefly quartz, mica, and clay minerals

Ironstone Concretion (Ferruginous Concretion / Limonite-Goethite Aggregate) — sedimentary

Ironstone Concretion

Ferruginous Concretion / Limonite-Goethite Aggregate

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

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

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

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

Prehnite

Ca2Al(AlSi3O10)(OH)2

Wavellite (Wavellite (Al3(PO4)2(OH, F)3·5H2O)) — mineral

Wavellite

Wavellite (Al3(PO4)2(OH, F)3·5H2O)

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

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Epidotite (Unakite-related Epidote) (Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))) — metamorphic

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Greenstone (Metabasalt / Greenschist) — metamorphic

Greenstone

Metabasalt / Greenschist

Greenstone (likely chlorite-rich metamorphic rock) (Greenschist; commonly composed of chlorite, actinolite, epidote, and albite) — metamorphic

Greenstone (likely chlorite-rich metamorphic rock)

Greenschist; commonly composed of chlorite, actinolite, epidote, and albite

Lapis Lazuli (Low Grade) (Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)) — metamorphic

Lapis Lazuli (Low Grade)

Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)

Limonite Concretion (Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O) — sedimentary

Limonite Concretion

Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O

Chert / Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Jasper

Microcrystalline Quartz (SiO2)

Green Jasper / Green Quartz (Silicon dioxide (SiO2) with mineral impurities) — sedimentary

Green Jasper / Green Quartz

Silicon dioxide (SiO2) with mineral impurities

Jadeite (Jadeite (NaAlSi2O6)) — mineral

Jadeite

Jadeite (NaAlSi2O6)

Pink Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Pink Opal

Hydrated amorphous silica (SiO2·nH2O)

Greenstone (Greenschist (primarily composed of chlorite, actinolite, and epidote)) — metamorphic

Greenstone

Greenschist (primarily composed of chlorite, actinolite, and epidote)

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

Epidote

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

Likely slate or shale fragment (Slate; predominantly fine-grained clay minerals, quartz, and mica) — metamorphic

Likely slate or shale fragment

Slate; predominantly fine-grained clay minerals, quartz, and mica

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

Ironstone Concretion

Ironstone (Limonite/Goethite/Hematite mixture)

Likely slate (Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz) — metamorphic

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate (Anyolite (Ruby in green zoisite) or artificially altered chalcedony) — metamorphic

Ruby in Zoisite (Anyolite) or possibly a dyed stone/agate

Anyolite (Ruby in green zoisite) or artificially altered chalcedony

Limonite (FeO(OH)·nH2O) — mineral

Limonite

FeO(OH)·nH2O

Epidote (Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))) — mineral

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Anthracite Coal (Anthracite (Carbon based)) — metamorphic

Anthracite Coal

Anthracite (Carbon based)

Jadeite (NaAl(Si2O6)) — gemstone

Jadeite

NaAl(Si2O6)

Green Jade (Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)) — gemstone

Green Jade

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)