Blue Apatite
Calcium Fluorophosphate (Ca5(PO4)3F)
mineral
Category
Metamorphic Mineral
Browse metamorphic mineral specimens identified by the Rock Identifier community.
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River Stone (possibly Gneiss)
Metamorphic Gneiss
metamorphic
Chalcopyrite (Peacock Ore)
Chalcopyrite (CuFeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Magnetite (Lodestone variant potential)
Magnetite (Fe3O4)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Tumbled green aventurine (probable)
Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions
mineral
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
White marble (likely calcitic marble)
Calcite-rich marble; primarily calcium carbonate, CaCO₃
metamorphic
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Blue Quartz (Blue Aventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Dark gray metamorphic rock fragment
Likely slate or fine-grained schist; mineral composition cannot be confirmed from the image
metamorphic
Greenstone
Metamorphic Greenstone (Greenschist facies)
metamorphic
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Fuchsite Gneiss or Schist
Muscovite (variety Fuchsite) within Metamorphic Host Rock
metamorphic
Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica assemblage
metamorphic
Tumbled or weathered gneiss
Feldspar–quartz–mica gneiss (composition variable)
metamorphic
Foliated gneiss, possibly migmatitic gneiss
Gneiss; primarily quartz, feldspar, and mica (biotite/muscovite), with possible amphibole
metamorphic
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Unidentified small mineral fragments
Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image
mineral
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic
Muscovite Mica
Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2
mineral
Magnetite-rich ironstone (probable magnetite ore)
Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral