Quartz Geode
Silicon dioxide (SiO2)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Quartz Geode
Silicon dioxide (SiO2)
Gold
Native Gold (Au)
Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore
Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz with Chlorite/Mica inclusions
Silicon Dioxide (SiO2) with inclusions
Milky Quartz
Silicon Dioxide (SiO2)
Weathered quartz-rich rock fragment
Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image
Milky Quartz
Silicon Dioxide (SiO2)
Agate (Polished Slice)
Silicon Dioxide (SiO2)
Quartz
Quartz (SiO2)
Sandstone Cobble with Iron Staining
Arenite with Limonite/Hematite staining
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Quartz Druze (on Matrix)
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Basalt with Quartz/Calcite Veins
Extrusive mafic igneous rock with hydrothermal mineralization
Yellow Quartz
Silicon Dioxide (SiO2)
Chert
Silicon dioxide (SiO2)
White calcite (likely tumbled calcite or marble fragment)
Calcite, calcium carbonate (CaCO₃); if the specimen is granular and rock-like, it may be marble, a calcite-rich metamorphic rock
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
Sandstone
Clastic Sedimentary Rock
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
Druzy Quartz Geode (Oco or Moroccan variety)
Silicon Dioxide (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
Common Quartz Pebble
Silicon dioxide (SiO2) rock fragment
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz (Milky/Smoky Quartz)
Silicon Dioxide (SiO2)