Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
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Gneiss (specifically Granitic Gneiss)
Gneiss
metamorphic
Granite Gneiss River Rock
Gneiss
Metamorphic
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Pegmatite
Igneous Pegmatite
igneous
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
Chalcedony / Agate with Botryoidal Quartz
Silicon Dioxide (SiO2)
sedimentary
Folded Schist / Gneiss (Metamorphic Rock)
Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)
metamorphic
Biotite-bearing metamorphic rock, likely schist
Mica schist; chiefly quartz, feldspar, and biotite mica
metamorphic
Quartz-rich granite or granitic gneiss cobble
Granite; primarily quartz, feldspar, and mica, possibly with gneissic deformation
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Stone (likely Siltstone or fine-grained Basalt)
Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)
sedimentary or igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Greenstone
Greenschist / Meta-basalt
metamorphic
Fairburn Agate
Cryptocrystalline Quartz (SiO2) with trace Iron Oxides
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
igneous/sedimentary mixed (Orbicular Jasper)
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Greywacke (Stream Pebble with Quartz/Calcite Veins)
Greywacke sandstone / Metagraywacke
sedimentary
Fossiliferous Chert
Silicon Dioxide (SiO2) with fossil inclusions
sedimentary
Basalt and Quartz Pebble
Basalt (Igneous) and Quartzite/Quartz (SiO2) pebble
igneous and sedimentary
Liesegang Ring Siltstone
Siltstone with iron oxide Liesegang bands
sedimentary
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert / Flint Conglomerate
Silicified Sedimentary Breccia (primarily SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Quartz Geode Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert (Agatized/Banded)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Chalcedony with Matrix
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz-bearing rock or quartz-rich mineral specimen
Quartz, silicon dioxide (SiO₂); exact host rock is uncertain from the image
mineral
Chert Nodule in Limestone (Flint in Chalk)
SiO2 (Microcrystalline Quartz) in CaCO3 (Calcite)
sedimentary
Chert (within Limestone matrix)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert
Chert (SiO2)
sedimentary
Chalcedony / Quartz Nodule (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Green Aventurine (Carved)
Silicon Dioxide (Quartz variant) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O(OH)2)
mineral