Fuchsite
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Brecciated Jasper (Polished)
Silicon Dioxide (SiO2) with Iron Oxide Impurities
sedimentary
Likely chlorite-bearing schist (possibly greenschist)
Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar
metamorphic
Weathered greenstone
Metamorphosed mafic rock, commonly chlorite–actinolite schist or altered basalt
metamorphic
Picasso Jasper (Picasso Stone)
Metamorphosed Calcium Carbonate (Silicified Limestone)
sedimentary
Chlorite-rich schist (probable greenschist)
Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Garnet-Bearing Gneiss
Garnetiferous Feldspathic Gneiss
metamorphic
Slate
Slate; predominantly fine-grained mica- and clay-mineral rock, commonly derived from shale
metamorphic
Likely graphite-rich metamorphic rock (graphitic schist)
Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides
metamorphic
Limonite
FeO(OH)·nH2O
mineral
Limonite
FeO(OH)·nH2O
mineral
Black shale or slate fragment
Carbonaceous shale; possibly low-grade slate (clay minerals, quartz, carbon/graphite)
metamorphic
Jadeite
NaAlSi2O6
gemstone
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
gemstone
Anthracite Coal
Anthracite coal (Carbon)
metamorphic
Greenstone
Metabasalt
metamorphic
Dark slate (probable)
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz; exact identification is uncertain from the photograph.
metamorphic
Weathered metamorphic rock, likely chlorite schist or greenstone
Chlorite-rich schist/greenschist; exact identification requires testing
metamorphic
Epidote Water-Worn Pebble
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
metamorphic
Gray Slate Pebble
Slate (metamorphosed mudstone/shale)
metamorphic
Slate
Slate (Metamorphosed Mudstone/Shale)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Greenstone (Epidisite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)
metamorphic
Greenstone / Greenschist
Greenschist (metamorphosed mafic rock)
metamorphic
Greenstone or Metabasalt
Metabasalt / Chlorite Schist
metamorphic
Greenstone (Epidosite or Serpentinite)
Metabasalt / Epidote-Chlorite Schist
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium
mineral
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Phyllite
Phyllite (Foliated metamorphic rock)
metamorphic
Greenstone
Metabasalt / Chlorite Schist
metamorphic
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Slate
Metamorphic pelitic rock
metamorphic
Green Schist (Greenschist)
Greenschist facies metamorphic rock
metamorphic
Slate
Slate (Metamorphic Rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Jadeite
NaAlSi2O6
gemstone
Fuchsite in Quartz (or Emerald in Fuchsite / Verdite)
Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz Matrix
metamorphic
Anthracite Coal
Anthracite
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Fine-grained gray stone, likely slate or weathered basalt
Indeterminate; possible slate (foliated phyllite-grade shale)
metamorphic
Dark metamorphic rock, likely slate or phyllite
Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage
metamorphic