Schist
Schist
metamorphic
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
French Bulldog (Blue Variety)
Canis lupus familiaris
Organic (Biological Organism)
Schist
Mica Schist
metamorphic
Greenstone or Epidote-rich rock
Epidote or Chlorite schist/greenstone
metamorphic
Gneiss (with iron staining)
Gneiss
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Sapphirine in Matrix
Sapphirine (Mg,Al)8(Al,Si)6O20
mineral
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Schist
Mica Schist
metamorphic
Schist
Schist (various mineralogical compositions including mica, chlorite, talc, etc.)
Metamorphic
Ruby in Quartz with Tourmaline
Corundum (Al2O3) in Silicon Dioxide (SiO2) with Schorl
metamorphic
Quartz Pebble
Silicon dioxide (SiO2)
mineral
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Larimar
Pectolite, NaCa2Si3O8(OH)
gemstone
Green Aventurine
Aventurine Quartz (SiO2 with fuchsite inclusions)
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Granite Glacial Erratic
Phaneritic Plutonic Felsic Rock (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 – SiO2)
igneous
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Basalt (Weathered River Stone)
Basalt (Extrusive Mafic Igneous Rock)
igneous
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Bacan Stone (Chrysocolla-in-Chalcedony)
Chrysocolla in Chalcedony (SiO2 with (Cu, Al)2H2Si2O5(OH)4·nH2O)
mineral
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Greenstone / River Jadeite pebble
Metavolcanic rock / Chlorite or Actinolite-rich schist
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Ruby (set in a gold pendant)
Ruby (Variety of Corundum, Al2O3)
mineral
Manhattan Schist
Manhattan Schist (Aluminous Metasedimentary Rock)
metamorphic
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Slate
Foliated low-grade metamorphic rock
metamorphic
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Slate
Foliated Metamorphic Rock (composed mainly of clay minerals or micas)
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide - SiO2)
Mineral