Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
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Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Vein Quartz in Basalt or Mafic Rock
Silicon Dioxide (Quartz veins in volcanic host rock)
igneous
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Quartz-veined Diabase or Basalt Pebble
Diabase or Basalt with Hydrothermal Quartz Veins (SiO2)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Geode
Quartz / Chalcedony nodule
sedimentary
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Gneiss (with Garnet)
Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Agate
Chalcedony (SiO2)
gemstone
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
mineral
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Quartz Cluster (Likely Ferruginous)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Fluorite in Matrix
Calcium Fluoride (CaF2) with Quartz/Calcite matrix
mineral
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Quartz Vein in Schist
Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)
metamorphic
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Prehnite with Epidote and Quartz
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet Gneiss or Mica Schist with Garnet
Almandine Garnet-bearing Gneiss
metamorphic
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Weathered quartz-rich metamorphic rock, likely gneiss or quartzite
Quartz (SiO₂)-bearing gneiss; exact identification requires a fresh surface and tests
metamorphic
Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)
Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (partially iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Quartz-veined Gneiss
Gneiss with Quartz (SiO2) intrusions
metamorphic