Gneiss
Gneiss (Metamorphic Rock)
Category
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
Gneiss
Gneiss (Metamorphic Rock)
Gneissic River Cobble
Gneiss
Greenstone (Prase / Nephrite / Serpentine mix)
Metamorphosed ultramafic rock / greenstone facies
Tumbled green stone, likely serpentine
Serpentinite; principally serpentine-group minerals, Mg₃Si₂O₅(OH)₄
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Polished green-and-white stone, likely serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (interlocking actinolite–tremolite)
Tumbled dark green stone, likely serpentine
Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄)
K-Feldspar (Potassium Feldspar)
Orthoclase / Microcline (KAlSi3O8)
Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
Gneiss
High-grade Metamorphic Gneiss
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
Yellow Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Serpentine (New Jade)
Antigorite/Lizardite [Mg3Si2O5(OH)4]
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Tumbled green-and-white stone, likely serpentine
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins
Gneiss
Gneissic Metamorphic Rock
Gneiss
Gneiss (High-grade metamorphic rock)
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
Serpentine (Infinite Stone)
Serpentinite (Hydrous magnesium iron silicate)
Gneiss
Gneiss (Metamorphic Rock)
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
Banded Gneiss
Metamorphic Gneiss
Banded Gneiss
Gneiss (Metamorphic Rock)
River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
Epidote and Quartz in Basalt
Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt
Schist
Schist
Polished dark-green stone, possibly serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)
Green Gneiss
Metamorphic Gneiss
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Banded Gneiss
Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)
Green serpentine
Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄
Gneiss (Pebble)
Gneiss
Actinolite (likely fibrous amphibole)
Actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possibly an actinolite–tremolite specimen
Feldspar
Potassium Feldspar (KAlSi3O8)
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
Agatized Petrified Wood
Silicon Dioxide (SiO2) - Chalcedony pseudomorph after Wood
Gneiss
Gneiss
Gneiss
Gneiss
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn)2-3(Si, Al, Fe)2O5(OH)4
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
River Stone (possibly Gneiss)
Metamorphic Gneiss