Clear Quartz
Silicon Dioxide (SiO2)
Category
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
Clear Quartz
Silicon Dioxide (SiO2)
Banded Iron Formation
Banded Iron Formation (BIF)
Amethyst
Amethyst (Silicon Dioxide, SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Sandstone (Quartzose Pebble)
Clastic sedimentary rock (primarily SiO2)
River Quartz (Milky and Smoky mix)
Silicon Dioxide (SiO2)
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
Yellow Quartz (Chalcedony)
Silicon Dioxide (SiO2)
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
Basalt River Cobble
Basalt
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
Sandstone Beach Pebble
Clastic sedimentary rock (SiO2 with iron oxide cement)
Chert (and/or Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Red Sandstone
Arenite (with Iron Oxide cement)
Dalmatian Jasper
Peralkaline Quartz Feldspar Porphyry
Chert (Quartz Variety)
Chert (mostly SiO2 / Silicon Dioxide)
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
Chert (Brown variety)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
Schist with Quartz Veins
Schist with Quartz (SiO2)
Sandstone
Arenite (SiO2 principal component)
Pyrite
Iron Disulfide (FeS2)
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Jasper (specifically Red or Brecciated Jasper variant)
Jasper (Microcrystalline Quartz - SiO2)
Rough Quartz
Quartz (Silicon Dioxide, SiO2)
Chert (often called Flint or Jasper)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Amethyst (Quartz)
Silicon Dioxide with Iron impurities (SiO2)
Graywacke
Graywacke
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
Yellow Quartz (Citrine or Yellow Chalcedony)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Red Sandstone (Hematitic)
Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)