Slate
Slate; fine-grained foliated metamorphic rock, commonly derived from shale or mudstone
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Greenschist
Greenschist metamorphic rock
metamorphic
Slate
Metamorphic pelitic rock
metamorphic
Slate
Metamorphic pelitic rock
metamorphic
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
metamorphic
Greenschist
Chlorite schist
metamorphic
Polished Red Quartz (or Carnelian / Red Jasper)
Silicon Dioxide (SiO2)
mineral
Greenschist
Greenschist
metamorphic
Slate Pebble
Low-grade Metamorphosed Shale (Slate)
metamorphic
Slate
Slate (Metamorphic claystone/shale)
metamorphic
Dark gray foliated metamorphic rock, likely slate or phyllite
Slate/phyllite; chiefly quartz, mica, and chlorite
metamorphic
Lapis Lazuli (Low-grade)
Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Slate
Foliated Metamorphic Rock (Slate)
metamorphic
Epidote or Unakite Rock
Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Weathered metamorphic rock, likely greenschist or amphibolite
Chlorite–actinolite schist/amphibolite; composition likely quartz, feldspar, chlorite, amphibole, and epidote
metamorphic
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Purple-gray shale or slate fragment
Argillite/slate, chiefly compacted clay minerals with quartz and mica
metamorphic
Red Jasper
Silicon Dioxide (SiO₂)
sedimentary
Tumbled green epidote–quartz (probable)
Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH), likely intergrown with quartz and/or chlorite
mineral
Weathered gray metamorphic rock, likely slate or phyllite
Fine-grained foliated metamorphic rock; commonly quartz–mica–chlorite, possibly chlorite phyllite
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Banded gray stone, likely slate or fine-grained metamorphic rock
Probably slate or phyllite; composition commonly mica, quartz, and clay-derived minerals
metamorphic
Greenstone
Metabasalt / Greenstone (low-grade metamorphic rock)
metamorphic
Greenstone
Metabasalt (composed of chlorite, epidote, and actinolite)
metamorphic
Greenstone
Metabasalt or Greenschist (often contains Chlorite, Actinolite, and Epidote)
metamorphic
Slate
Slate
metamorphic
Prehnite with Epidote and Quartz
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Greenstone / Greywacke
Metagraywacke (contains Chlorite and Epidote)
metamorphic
Slate
Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Greenstone
Metabasalt
metamorphic
Citrine
Silicon dioxide (Quartz variety, SiO2)
gemstone
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Dark gray slate (possibly argillite or shale)
Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals
metamorphic
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral