Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Gneiss
Gneiss
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with fuchsite inclusions)
Mineral
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Limonite (also known as Yellow Ochre or Brown Hematite)
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
Mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
![Fuchsite (Chromium-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]) — mineral](https://media.rockidentification.com/87a8e209-5ca2-4719-8f49-8d1b07efc14a-thumbnail.jpg)
Fuchsite
Chromium-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Rhodonite, Gray Moonstone, and White Feldspar Mix
Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)
mineral
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Dumortierite Quartz
Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)
metamorphic
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (Metamorphic Cobble)
Gneiss
metamorphic
Gneiss (Schistose)
Gneiss
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Gneiss (specifically a Granitic Gneiss)
Gneiss (Composition: Quartz, Feldspar, Mica)
metamorphic
Mica Schist with Iron Staining
Mica Schist
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral