Green Schist
Greenschist (composed of chlorite, epidote, and actinolite)
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Limonite
FeO(OH)•nH2O
mineral
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Purple Slate
Foliated slate (Pelitic origin)
metamorphic
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Emerald in Quartz Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Greenstone (Epidote/Chlorite-rich Metabasalt)
Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Red Jasper
Silicon dioxide (microcrystalline quartz, $SiO_2$)
sedimentary
Jasper with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Dark slate or fine-grained metamorphic rock
Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar
metamorphic
Ironstone Concretion (Limonite/Goethite)
Ferruginous Siltstone / Limonite Concretion (FeOO(OH)·nH2O)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Raw Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Rounded greenstone pebble
Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing
metamorphic
Greenschist
Greenschist (Chlorite-Epidote-Actinolite Schist)
metamorphic
Anthracite Coal
Anthracite (high-rank coal)
metamorphic
Greenstone pebble (likely altered basalt)
Chlorite–actinolite–epidote altered basalt; precise identification requires testing
metamorphic
Greenstone, possibly serpentine or altered basalt
Serpentinite (Mg₃Si₂O₅(OH)₄) or chlorite-epidote altered basalt; identification is uncertain from the image
metamorphic
Dark gray metamorphic rock fragment, likely slate or schist
Fine-grained foliated silicate rock; composition likely quartz, feldspar, mica, and/or chlorite
metamorphic
Pyrite in Slate
Iron Sulfide (FeS2) in Slate host matrix
metamorphic
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Polished tiger’s-eye cabochon (probable)
Quartz variety, SiO₂, with fibrous riebeckite/crocidolite-derived inclusions
metamorphic
Biotite-rich schist (probable mica schist)
Mica schist; predominantly quartz, biotite, and feldspar
metamorphic
Ferruginous Sandstone
Arenite with Iron-Oxide cement (Fe2O3 · nH2O)
sedimentary
Greenstone pebble
Greenstone (metamorphosed mafic rock, commonly altered basalt); exact identification requires testing
metamorphic
Weathered slate or phyllite
Foliated metamorphic rock, commonly quartz–mica–chlorite assemblage
metamorphic
Greenstone with rusty mineral patches
Greenstone (metamorphosed mafic volcanic rock; likely chlorite–epidote–actinolite assemblage)
metamorphic
Tumbled tiger’s-eye
Quartz variety with fibrous crocidolite pseudomorphs; SiO₂
metamorphic