Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Category
Sedimentary And Metamorphic
Browse sedimentary and metamorphic specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Jasper / Yellow Jasper with Chlorite or Epidote inclusions
Silicon Dioxide (SiO2) with iron oxide and silicate impurities
sedimentary
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2 based)
metamorphic
Yellow Quartzite (Onyx Pebble)
Silicon Dioxide (SiO2) - Quartzite
metamorphic
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Mica Schist with Biotite or Muscovite
Metamorphic rock rich in sheet silicates
metamorphic
Gneiss
Gneiss
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Anthracite Coal
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Coal (Anthracite)
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Gneis
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Mica Schist
Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)
metamorphic
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 with K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist
metamorphic
Graphite
Graphite (Carbon, C)
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Tumbled Agate (Dyed Blue)
Silicon Dioxide (Chalcedony variety)
gemstone
Quartz (Water-worn Pebbles)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Adventurine (Green)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic