Chlorite-rich schist (probable greenschist)
Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism
metamorphic
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Coal
Bituminous Coal / Anthracite
sedimentary
Iron-stained quartzite or quartz-rich sandstone
Quartzite, predominantly SiO₂, with iron-oxide staining
metamorphic
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with Fe impurities)
mineral
Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite; chiefly serpentine-group minerals (lizardite, chrysotile, antigorite), with magnetite and relic mafic minerals
metamorphic
Mica Schist
Schist (muscovite-quartz dominant)
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Beryl (var. Aquamarine/Blue Beryl) in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
White Quartz
Quartz (SiO2)
Mineral
Serpentine
Antigorite-Lizardite-Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Schist
Mica Schist
metamorphic
Tumbled orange chalcedony and a gray stone disk
Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate
mineral
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Pale green rounded boulder, likely altered serpentinite or greenstone
Probable serpentinized ultramafic rock; exact identification requires testing
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Fluorapatite / Ca5(PO4)3F
mineral
Fuchsite Gneiss (Green Quartzite)
Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)
metamorphic
Likely quartz-rich rock fragment
Quartz (SiO₂), possibly iron-stained quartz or quartzite
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Bituminous Coal
Coal (Organically derived sedimentary rock)
sedimentary
Tumbled quartz-bearing rock, possibly garnet-bearing quartzite
Quartz-dominant silicate rock; visible minerals may include quartz, iron oxides, and dark mica or amphibole
metamorphic
Rhodonite
Rhodonite (Manganese silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Schist
Mica Schist
metamorphic
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Serpentine (likely serpentinized ultramafic rock)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite
metamorphic
Pink Quartz (Inclusion-rich Quartzite)
SiO2 (Silicon Dioxide) with Iron Oxide / Hematite inclusions
metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fossil shark tooth
Likely fossilized shark tooth, possibly *Carcharocles* or *Otodus* species
fossil