Gneiss
Metamorphic Rock (Gneissic texture)
metamorphic
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
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Fluorite
Calcium Fluoride (CaF2)
mineral
Pink Gneiss / Pink Granite Gneiss
Felsic Gneiss (dominated by Orthoclase Feldspar and Quartz)
metamorphic
Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
High-grade foliated metamorphic rock
metamorphic
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diabase (also known as Dolerite)
Diabase / Dolerite
igneous
Rounded basalt pebble
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Black Sand (Magnetite/Heavy Mineral Concentrate)
Magnetite-rich Placers (Fe3O4)
sedimentary
Arkosic Sandstone
Arkose
sedimentary
Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
Greenstone / Metagraywacke
Metamorphosed basaltic or sedimentary rock (Complex Silicate)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Polished dark pebble, possibly basalt or chert
Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline silica (chert)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Vesicular basalt (possible scoria)
Basaltic volcanic rock; chiefly plagioclase, pyroxene, and iron-rich minerals, with vesicles formed by trapped gas
igneous
Quartz
Quartz (SiO₂)
Mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Milky quartz (likely quartz vein fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Basalt pebble
Basalt; primarily plagioclase feldspar, pyroxene, and often olivine
igneous
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Basalt or Siltstone Pebbles
Mafic volcanic rock (Basalt) or Indurated Siltstone
igneous or sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Granite (likely biotite granite)
Coarse-grained granitic rock; chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Quartz (likely heat-treated or colored cord)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic