Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Gneiss
Granitic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Greenschist
Chlorite Schist
metamorphic
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz Pebble
Silicon dioxide (SiO2)
mineral
Granite Pebble
Granitoid (Felsic Plutonic Rock)
igneous
Gneiss
Gneiss
metamorphic
Rounded quartz-rich cobble
Likely quartzite or quartz-rich sandstone; exact identification requires a fresh break or hardness test
sedimentary
Gneissic Granite
Granite Gneiss
metamorphic
Yellow Aventurine
Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Fuchsite or Green Mica Schist
Muscovite variant (KAl2(AlSi3O10)(OH)2 with Cr)
metamorphic
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Quartz-rich druse specimen
Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor feldspar or mica
mineral
Graphite
Graphite (Carbon, C)
metamorphic
Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Hard Sandstone (Quartzite)
Quartz-rich Sedimentary Rock (Proto-Quartzite)
metamorphic
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Petrified Wood with Lichen
Silicified Wood (SiO2) colonized by crustose lichens
fossil
Graphite
Graphite (Carbon, C)
mineral
Weathered mica-rich schist
Mica schist, likely muscovite- or biotite-bearing; precise identification requires closer examination
metamorphic
Likely mica-rich schist (possibly phyllite)
Muscovite–biotite schist; exact identification requires examination of a fresh surface
metamorphic
Chondrite Meteorite
Ordinary Chondrite (L or H type)
igneous
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Greenschist
Chlorite schist
metamorphic
Gneiss (or Granite Gneiss)
Metamorphic rock rich in quartz, feldspar, and biotite/amphibole
metamorphic
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (Silicate rock)
metamorphic