Slate fragment
Slate; predominantly fine-grained mica/clay minerals, commonly muscovite, chlorite, and quartz
metamorphic
Category
Metamorphic (Low Grade)
Browse metamorphic (low grade) specimens identified by the Rock Identifier community.
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Jadeite Carving (Pixiu)
Jadeite (NaAlSi2O6)
gemstone
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Greenschist
Chlorite schist
metamorphic
Greenstone
Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote
metamorphic
Green Slate (Greenstone)
Foliated Metamorphic Rock (rich in Chlorite/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
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Greenstone Pebble
Metabasalt / Greenschist
metamorphic
Beach Pebble (Nephrite Jade / Chalcedony)
Ca2(Mg,Fe)5Si8O22(OH)2 / SiO2
metamorphic
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Chlorite (Small Flakes/Sand)
Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
mineral
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Greenstone (River Pebble)
Metabasalt / Greenschist
metamorphic
Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Banded Slate (Lithified Mudstone)
Low-grade Metamorphosed Mudstone / Slate
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)AlSi3O12(OH))
mineral
Greenstone
Metabasalt / Greenschist
metamorphic
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Slate
Slate; predominantly fine-grained phyllosilicates, commonly muscovite/illite and chlorite with quartz
metamorphic
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Greenstone (likely chlorite-rich metamorphic rock)
Greenschist; commonly composed of chlorite, actinolite, and epidote, with possible albite
metamorphic
Dark gray metamorphic rock, likely slate or phyllite
Fine-grained foliated rock composed mainly of mica, chlorite, and quartz; exact identification requires testing
metamorphic
River Cobble (likely Metasedimentary or Basalt)
Metamorphosed Siltstone or Altered Fine-grained Igneous Rock
metamorphic
Epidote (Greenstone)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Riverstone (likely Gray Slate or Siltstone)
Metamorphosed fine-grained sedimentary rock (Argillite/Slate)
metamorphic
Foliated metamorphic rock, likely slate or phyllite
Slate–phyllite; primarily quartz, mica, and clay-derived minerals
metamorphic
Greenstone
Metabasalts and metavolcanics
metamorphic
Basalt with Epidote (Greenstone)
Epidote-bearing Metabasalt
metamorphic
Nephrite Jade
Nephrite (Silicate mineral: Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Greenstone
Chlorite schist or metabasalt depending on specific composition
Metamorphic
Quartz Pebble with Chlorite or Epidote Inclusions
Silicon Dioxide (SiO2) with inclusions
metamorphic
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Polished tiger’s eye
Quartz (microcrystalline SiO₂) with crocidolite-derived iron oxides
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Greenish-gray slate fragment
Slate; fine-grained metamorphosed mudstone, commonly mica- and chlorite-bearing
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic