Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Mica Schist
Medium-grade regional metamorphic rock (composition varies)
metamorphic
Brown Pebble (River Rock)
Indeterminate (Likely Silicon Dioxide / Quartz-rich)
sedimentary
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Gneiss
Gneiss
metamorphic
Greenschist
Greenschist (Chlorite-Epidote-Actinolite Schist)
metamorphic
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Smoky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Iron Meteorite (Candidate)
Iron Meteorite (Siderite)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Pink Polished Marble (or Limestone) Pillar
Recrystallized Calcium Carbonate (CaCO3)
metamorphic
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Granite River Pebble
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
metamorphic
Quartz
Quartz (SiO2)
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Moonstone (Feldspar)
Orthoclase feldspar, (K,Na)AlSi3O8
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Granite Gneiss
Gneiss (Polymetamorphic Quartz-Feldspar-Mica rock)
metamorphic
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Gneiss (Granite Gneiss)
Gneiss
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Granite
Granite
igneous
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Blue Quartzite
Quartzite (silicon dioxide, SiO2)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Green Quartz (including Prase or Aventurine variants)
Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)
mineral