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)
Greenstone
Chlorite schist / Meta-basalt
Sandstone
Quartz Sandstone (predominantly)
Aventurine (Green Quartz)
Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
Slate
Foliated Metamorphic Slate
Sandstone (Fluvial Pebble)
Arenite
Amazonite
Amazonite (KAlSi3O8) - a variety of Microcline Feldspar
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Ferric Iron Oxides
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 predominant)
Banded Agate
Silicon Dioxide (SiO2)
Sandstone (with Chert/Quartzite)
Arenite (primarily SiO2)
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Conglomerate
Conglomerate (Detrital sedimentary rock)
White Topaz
Topaz [Al2SiO4(F,OH)2]
Green Jasper
Silicon Dioxide (SiO2) with impurities
Greenschist
Greenschist (chlorite-epidote schist)
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
Pegmatite (Granitic Pegmatite)
Pegmatite (Quartz + Potassium Feldspar + Mica)
Quartz Geode Segment
Crystalline Silicon Dioxide (SiO2)
Rough Garnet (likely Almandine or Pyrope)
Garnet group; Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
Garnet Schist
Almandine Garnet-bearing Mica Schist
Rock Crystal Quartz
Quartz (SiO₂)
Unakite
Epidotized Granite
Gneiss
Foliated quartzo-feldspathic gneiss, commonly containing biotite or amphibole
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
Gneiss
Metamorphic Gneiss
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
Granite
Phaneritic Felsic Intrusive Igneous Rock
Granite
Granite (phaneritic felsic intrusive rock)
Gneiss
Foliated Metamorphic Rock
Greenschist
Greenschist (Chlorite-actinolite schist)
Gabbro
Gabbro