Chert
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary Rock
Browse sedimentary rock specimens identified by the Rock Identifier community.
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Quartz (Milky/Crystal Variety)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Gray/Tan Bedded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (high iron oxide content)
sedimentary
Sandstone with Vitrinite/Coal inclusions
Arenite with Carbonaceous inclusions
sedimentary
Graphite Schist
C (Carbonaceous Schist)
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Clear Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Quartz (Orthoquartzite)
Silicon Dioxide (SiO2)
sedimentary
Chert (with Manganese Oxide coating)
Microcrystalline Quartz (SiO2)
sedimentary
Hardened Gray Mudstone
Argillite / Silicified Mudstone (principally SiO2 and Al2Si2O5(OH)4)
sedimentary
Tufa
Calcareous Tufa (Calcium carbonate, CaCO3)
sedimentary
Jasper (Red/Brown Variety)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)
sedimentary
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron Oxide cement (primarily Fe2O3)
sedimentary
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Quartzite (River Pebble)
Metamorphosed Sandstone (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary (microcrystalline quartz)
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
mineral
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert (often called Jasper or River Siltstone)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Jasper Agate (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite/iron oxide inclusions
sedimentary
Red Jasper
Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)
sedimentary
Jasper with Quartz Druzy
Silicon Dioxide (SiO2)
sedimentary
Liesegang Rings (in Sandstone or Siltstone)
Ferruginous Sandstone with Liesegang Banding
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Arenite / Wacke (SiO2 based with lithic fragments)
sedimentary
Arkosic Sandstone
Arkose
sedimentary
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous
Boulder Opal
Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)
Mineral
Clear Quartz Sphere
Quartz (Silicon Dioxide, SiO2)
mineral