Dark metamorphic cobble, likely slate or phyllite
Foliated metamorphic rock, probably carbonaceous slate/phyllite; exact identification requires testing
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Slate or fine-grained shale
Slate; predominantly quartz, mica, and clay-derived minerals
metamorphic
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
sedimentary
Brown Jasper / River Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Dark shale or slate fragment
Carbonaceous shale, possibly low-grade slate; composition mainly clay minerals, quartz, and organic carbon
metamorphic
Likely biotite-rich schist with a quartz/feldspar inclusion
Mica schist; chiefly quartz (SiO₂), feldspar, and biotite mica
metamorphic
Green Calcite
Calcite (CaCO3)
mineral
Epidote in Quartz (Epidosite)
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Mixed Rock and Mineral Collection
Multiple geological specimens
mineral
Epidote in Matrix (Unakite-like Rock Fragment)
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble
metamorphic
Eclogite
Eclogite (Omphacite-Garnet Rock)
metamorphic
Limonite
FeO(OH)·nH2O
mineral
Jadeite
NaAlSi2O6
mineral
Greenstone
Greenschist / Meta-basalt
metamorphic
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Greenstone
Metabasalt
metamorphic
Greenstone
Metabasalt
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Greenstone
Greenschist (Metamorphosed Mafic Rock)
metamorphic
Greenstone / Greenschist
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Greenstone
Metabasalt (Greenstone facies)
metamorphic
Greenstone
Metabasalt / Greenstone
metamorphic
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Limonite
Hydrated iron oxide-hydroxide, FeO(OH)·nH2O
mineral
Dark gray metamorphic rock fragment
Likely slate or fine-grained schist; mineral composition cannot be confirmed from the image
metamorphic
Greenstone / Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Actinolitic Schist
metamorphic
Serpentine
Serpentine Group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4
metamorphic
Faceted Gemstones (Mixed)
Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)
gemstone
Green Schist
Greenschist (Chlorite Schist)
metamorphic
Conglomerate
Clastic Sedimentary Rock
sedimentary
Greenstone (metamorphosed basalt)
Greenschist / Meta-basalt
metamorphic
Limonite
FeO(OH)·n(H2O)
mineral
Gneiss
Foliated quartz–feldspar–mica gneiss
metamorphic
Slate
Metamorphic pelitic rock
metamorphic
Slate
Metamorphic mudstone or shale
metamorphic
Greenschist (Greenstone)
Chlorite Schist / Greenschist Facies Rock
metamorphic
Muscovite Schist
Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Blue-gray metamorphic rock, possibly slate or phyllite
Likely quartz–mica-rich phyllite/slate; exact identification requires testing
metamorphic