Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
Learn about Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration) in the encyclopedia
View all →
Pink Granite
Phaneritic Granitoid
igneous
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
Greenschist
Greenschist facies metamorphic rock
metamorphic
Greenstone / Greenschist
Chlorite schist / Epidiorite / Metabasalt
metamorphic
Labradorite
Plagioclase Feldspar (Ca,Na)(Al,Si)4O8
mineral
Engraved polished dark stone (likely slate or basalt)
Probable fine-grained slate (microcrystalline phyllosilicates), possibly basalt; exact identification requires testing
metamorphic
Dacite
Dacite (Intermediate volcanic rock)
igneous
River Stone (likely Basalt or Gabro)
Mafic Igneous Rock
igneous
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Blue Topaz
Al2SiO4(F,OH)2
gemstone
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Amethyst (Geode Fragment)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Gneiss (Pebble)
Gneiss
metamorphic
Sandstone (Greywacke)
Arenite/Greywacke (SiO2 major)
sedimentary
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Slag Glass (Leland Blue variant)
Anthropogenic Vitreous Silicate
mineral
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Mixed rounded stream pebbles
Most appear to be granitic and mafic igneous rocks, including granite, gneiss, basalt, and possibly quartzite; exact identification is uncertain from the image.
igneous
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Rainbow Moonstone with Black Tourmaline
White Labradorite with Schorl (Na,Ca)(Al,Si)4O8
mineral
Greenstone or Chlorite Schist
Greenschist / Chlorite schist
metamorphic
Citrine
Silicon dioxide (SiO2)
mineral
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Citrine (likely Heat-Treated)
Quartz (Silicon Dioxide, SiO2)
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
K2 Jasper (K2 Stone)
Azurite in Granite / Quartzite
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Greenish Feldspathic Rock / Epidote Granite (Unakite-type or Epidote-bearing rock)
Epidotized Metamorphic/Igneous Rock
metamorphic
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Basalt Pebble (Beach Stone)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Green Aventurine
Aventurine (Quartz variety), SiO2
metamorphic
Granitoid (Granite/Gneiss mix)
Phaneritic Felsic Igneous Rock
igneous
Bronzite
Enstatite (magnesium iron silicate), (Mg,Fe2+)SiO3
mineral