Quartz Geode Fragment
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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Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Milky Quartz
Quartz (Silica / Silicon Dioxide), SiO2
mineral
Quartz-veined Sandstone
Sedimentary rock with quartz vein (SiO2)
sedimentary
Unknown Rock Fragment
Undetermined
igneous
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Amethyst-rich vesicular volcanic rock (probable amethyst basalt/scoria)
Quartz (SiO₂) in vesicular basaltic volcanic rock; precise identification requires testing
igneous
Basalt with Quartz/Feldspar Vein
Mafic Volcanic Rock (Basalt) with SiO2 hydrothermal vein
igneous
Quartz crystals on Basalt
SiO2 (Quartz) on Mafic Igneous Rock (Basalt)
igneous
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian variant)
Cryptocrystalline Silica (SiO2)
mineral
Weathered quartz-rich metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica gneiss/schist (tentative; image resolution limits certainty)
metamorphic
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Quartz / Agate Nodule
Silicon Dioxide (SiO2)
mineral
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone pebble
Sandstone (siliciclastic sedimentary rock)
sedimentary
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Geode
Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock
sedimentary
Quartz Crystal (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Shale
Fissile Mudstone
sedimentary
Quartz (Druzy) on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)
mineral