River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Gneiss
Banded gneiss; quartz–feldspar–mica rock
metamorphic
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
gemstone
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Greenstone
Protolith of basalt/gabbro (chlorite-epidote metamorphic facies)
metamorphic
Slate
Foliated Metamorphic Rock (composed mainly of Quartz, Illite, and Chlorite)
metamorphic
Serpentinite (or Green Quartz Pebble)
Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)
metamorphic
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Epidote (likely Pistacite in Epidosite rock)
Epidote: Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Banded metamorphic pebble, likely gneiss
Foliated gneiss; quartz–feldspar–mica assemblage
metamorphic
Iron-rich rock or Concretion
Ironstone or Limonite concretion
sedimentary
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Prehnite
Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2
mineral
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Fuchsite
Muscovite (chromium-rich), K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Greenstone
Metabasalt / Chlorite-actinolite-epidote schist
metamorphic
Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Greenschist
Greenschist facies rock (containing chlorite, actinolite, and epidote)
metamorphic
Greenstone
Greenschist
metamorphic
Tumbled greenstone or serpentine pebble
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); possibly nephrite jade if notably tough and dense
metamorphic
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
metamorphic
Dark gray metamorphic cobble, likely slate or phyllite
Foliated metapelite; possibly slate/phyllite composed mainly of quartz, mica, and chlorite
metamorphic
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Jadeite
NaAlSi2O6
mineral
Jadeite Jade
NaAlSi2O6
metamorphic
Greenschist (containing Epidote and Quartz)
Greenschist (Epidote-Chlorite-Actinolite Schist)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Weathered mica-rich schist
Mica schist, chiefly muscovite/biotite with quartz and feldspar
metamorphic
Greenstone or Epidote-rich rock
Epidote or Chlorite schist/greenstone
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Small quartz-rich stone, possibly iron-stained quartz or jasper
Quartz (SiO₂), potentially with iron-oxide inclusions
mineral
Greenstone
Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote
metamorphic
Green Schist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Serpentine
Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)
metamorphic
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Greenstone Pebble
Metabasalt / Greenschist
metamorphic
Beach Pebble (Nephrite Jade / Chalcedony)
Ca2(Mg,Fe)5Si8O22(OH)2 / SiO2
metamorphic