Greenstone
Greenschist / Greenstone (Epimetamorphic Rock)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Quartz-rich sandstone or granitic fragment
Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph
sedimentary
Aquamarine with Sunstone
Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8
Mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Pebble / Gravel
Clastic Sedimentary Specimen (likely Limestone or Quartzite base)
sedimentary
Labradorite (likely)
(Ca,Na)(Al,Si)4O8
mineral
Quartzite with Schist Inclusions
Metamorphosed Quartzite (SiO2) with minor mica/chlorite schist
metamorphic
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Graphite
Graphite (Carbon, C)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
sedimentary
Mica Schist
Metamorphic rock dominated by muscovite and/or biotite mica
metamorphic
Schist
Mica Schist (Complex Silicates)
metamorphic
Schist
Mica Schist
metamorphic
Pyrite in Matrix (likely Quartz or Schist matrix)
Iron Sulfide (FeS2)
mineral
Weathered granite (feldspathic, iron-stained granite)
Granite; primarily quartz, potassium feldspar, plagioclase feldspar, and minor mica/amphibole. Exact identification is uncertain from a single photograph.
igneous
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
sedimentary
Sandstone River Pebble
Arenite (SiO2 predominantly)
sedimentary
Rose Quartz with Schist Matrix
Silicon Dioxide (SiO2) with Mica-Schist
mineral
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Granitic Gneiss
Gneiss (quartz-feldspar-mica complex)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartzite pebble on Granite surface
Quartzite (small pebble) resting on polished Granite (Gneissic Granite countertop)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary
River Stone (Quartzite/Siltstone mixture)
Silicon Dioxide (SiO2) based metamorphosed sandstone
metamorphic or sedimentary
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Phyllite
Phyllite (Foliated metamorphic rock)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Rounded gray stone, likely slate or fine-grained sandstone
Probable slate (low-grade metamorphosed shale) or lithic sandstone; exact identification requires testing
sedimentary
Quartz with Mica/Schist inclusion
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6)
mineral
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Quartzite River Rock
Quartzite (SiO2 based metamorphic rock)
metamorphic