Kyanite
Kyanite (Al2SiO5)
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Green Schist
Greenschist (composed of chlorite, epidote, and actinolite)
metamorphic
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
mineral
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Epidote in Quartz
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)
metamorphic
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Greenstone
Silicon Dioxide (SiO2) with impurities
sedimentary
Phyllite (possibly low-grade greenish slate)
Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula
metamorphic
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Greenschist (Chlorite Schist)
Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)
metamorphic
Anthracite Coal
Anthracite (Carbon based fossil fuel)
metamorphic
Greenstone / altered mafic rock
Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing
metamorphic
Greenstone (Prase / Metavolcanic)
Metamorphosed volcanic rock (Greenstone)
metamorphic
Green Greenstone / Celadonite-bearing Metamorphic Rock
Greenschist / Celadonite / Serpentinitic pebble
metamorphic
Greenstone (Greenschist facies)
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
Metamorphic
Greenstone
Greenschist / Meta-basalt
metamorphic
Greenstone
Greenschist (Greened Metabasalt)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
sedimentary or metamorphic
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Chert (or potentially massive Quartz/Quartzite)
SiO2 (Silicon Dioxide)
sedimentary (if chert) / metamorphic (if quartzite)
Anthracite Coal with Sulfur staining
Anthracite (Carbon C with impurities)
metamorphic
Aquamarine (Pendant) and Jasper (Beads)
Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Pyrite in Slate
Iron Sulfide (FeS2) in Slate host matrix
metamorphic
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Polished tiger’s-eye cabochon (probable)
Quartz variety, SiO₂, with fibrous riebeckite/crocidolite-derived inclusions
metamorphic
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Greenschist
Greenschist (Chlorite-Epidote-Actinolite Schist)
metamorphic
Anthracite Coal
Anthracite (high-rank coal)
metamorphic
Jadeite (Nephrite-Jadeite blend)
Jadeite (NaAlSi2O6)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite with Chlorite
Metamorphic Quartzite (SiO2) with phyllosilicates
metamorphic
Bloodstone (Heliotrope)
SiO2 (Cryptocrystalline Quartz / Chalcedony)
mineral
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Siltstone
Siltstone (primarily SiO2 with Fe2O3)
sedimentary
Limonite (Ironstone Concretion)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Tiger's Eye
Quartz with riebeckite inclusions (SiO2)
mineral