Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
View all →
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Schist (Micaceous)
Mica Schist
metamorphic
River Rock (River Cobbles)
Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)
sedimentary
Greenstone (Altered Mafic Rock)
Greenschist / Meta-basalt
metamorphic
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
River Rocks and Pebbles
Mixed Silica-rich Sediments (SiO2 based)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Chakra Stone (Composite / Man-made Bonded Gemstones)
Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)
Combined Minerals / Metaphysical stones
Slate
Foliated Metamorphic Rock (primarily clay minerals and micas)
metamorphic
Yellow Quartzite Pebble
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Quartzite with Quartz Veining
Meta-quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Flagstone (Sandstone)
Clastic Sedimentary Rock (composed of quartz and feldspar)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fuchsite on Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities
metamorphic
Green Quartzite
Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss (with iron staining)
Gneiss
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Ironstone
Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)
sedimentary
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Quartz Cobble (River Rock)
Silicon Dioxide (SiO2)
mineral
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Mica Schist with Iron Staining
Mica Schist
metamorphic
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic