Banded Gneiss with Quartz Vein
Foliated Metamorphic Rock (Gneiss)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Eclogite
Omphacite-Pyrope Eclogite
metamorphic
Sandstone (with Manganese staining)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Gold Mineral
Native Gold (Au)
mineral
Sandstone
Arenite
sedimentary
Green Aventurine
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Greenstone (Epidisite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) and Chlorite)
metamorphic
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
metamorphic
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline to granular SiO₂, possibly with mica and feldspar
metamorphic
Green Schist
Greenschist
metamorphic
Pebble
Lithified clastic rock fragment / Quartz-rich pebble
sedimentary
Cordierite in Matrix (Iolite)
Magnesium iron aluminium cyclosilicate (Mg,Fe)2Al4Si5O18
metamorphic
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Ruby (Corundum)
Aluminium oxide (Al2O3) with Chromium traces
mineral
Yellow Sapphire
Corundum (Al2O3)
gemstone
Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Basalt with Epidote (Porphyry)
Basalt (with inclusions of Epidote/Feldspar)
igneous
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
sedimentary
Sandstone
Arenite (primarily Quartz-based)
sedimentary
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Iolite
Cordierite (Mg2Al3(AlSi5O18))
gemstone
Green Tourmaline (Verdelite) / Actinolite
Tourmaline group: Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH)4 / Actinolite: Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Likely weathered brown quartz-bearing rock
Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph
igneous
Granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Sandstone
Arenite (SiO2 based with cement)
sedimentary
Basalt with Quartz Infill
Basalt (Mafic Extrusive Volcanic Rock)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Anthracite Coal
Anthracite (Carbon-based solid)
metamorphic
Basalt with Oxidized Inclusions
Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Gneissic Granite (River Stone)
Protomylonite or Gneiss
metamorphic
Sapphire (likely blue synthetic sapphire or blue glass in a ring)
Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.
Mineral
Blue Schist / Lydian Stone / Chert with Glaucophane
Metamorphic rock containing quartz and glaucophane
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral