Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
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Gravel (Crushed Stone Aggregates)
Mixed Siliciclastic / Carbonate Aggregate
sedimentary
Jasper (likely Brecciated or Multi-colored)
Jasper (SiO2)
sedimentary
Mixed river stones and gravel
Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate
igneous, sedimentary, metamorphic
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
gemstone
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic
Bornite
Bornite (Cu5FeS4)
mineral
Epidote (likely Unakite component or Epidosite)
Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Granitoid (Granite/Gneiss mix)
Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)
igneous/metamorphic
Granite Gneiss
Granitoid Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Tumbled Black Stone
Unknown (possibly basalt, obsidian, or black jasper)
igneous or sedimentary
Fossil Coral
Cnidaria Anthozoa (Fossilized)
sedimentary
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Granite Pebble
Felsic Igneous Rock (Granitic composition)
igneous
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Tumbled pale-green stone, possibly serpentine
Unidentified green silicate; serpentine is a tentative visual match
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Gneiss
Metamorphic Gneiss
metamorphic
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Blue-Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Epidote
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Greenstone
Greenschist / Meta-basalt
metamorphic
Greenstone
Metabasalt
metamorphic
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
K2 Stone
Azurite in Granite
igneous
Epidote (Greenstone)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Gneiss (Metamorphic Pebble)
Metamorphic Rock (Quartz-Feldspar-Biotite Gneiss)
metamorphic
River Cobble (Quartzite / Granitic Gneiss)
Metamorphic Quartzite / Granitic Gneiss
metamorphic
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Likely mica-rich schist (possibly phyllite)
Muscovite–biotite schist; exact identification requires examination of a fresh surface
metamorphic
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous