Citrine
Silicon dioxide (SiO2)
mineral
Category
Metamorphic Rock
Browse metamorphic rock specimens identified by the Rock Identifier community.
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Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Dumortierite Quartz
Dumortierite (Al7BCuO15)
metamorphic
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Gneiss
Gneiss
metamorphic
Pebble (Likely Basalt or Siltstone)
Clastic sedimentary rock or mafic volcanic rock
Igneous or Sedimentary
Diopside (likely Chromian Diopside)
Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Spessartine Garnet
Manganese aluminum silicate (Mn2+3Al2(SiO4)3)
mineral
Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Gneiss (Augen Gneiss)
Augen Gneiss
metamorphic
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Greenschist
Chlorite schist
metamorphic
Garnet Schist
Almandine-Mica Schist
metamorphic
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Mica Schist with Quartz
Mica-Quartz Schist (Muscovite subclass)
metamorphic
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Basalt (River Pebble)
Mafic volcanic rock (rich in magnesium and iron)
igneous
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Graphite
Graphite (Carbon, C)
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Basalt with Quartz Veins
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Epidote with Quartz
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Basalt with Plagioclase Feldspar
Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts
Igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rainbow Moonstone
White Labradorite (Feldspar variety)
mineral
Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble / River stone
SiO2 (Silicon Dioxide)
mineral
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral