Chert (Quartz-rich)
Microcrystalline Silica (SiO2)
Category
Browse sedimentary (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Chert (Quartz-rich)
Microcrystalline Silica (SiO2)
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
Red Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
Band Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert (and Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Botryoidal Chalcedony
Cryptocrystalline Silicon Dioxide (SiO2)
Petrified Wood
Silicified Wood (SiO2)
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
Chert
Microcrystalline Quartz (SiO2) with iron oxide staining
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
Chert with Iron Oxide Staining
Microcrystalline Quartz (SiO2) with Limonite/Goethite staining
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
Black Onyx
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Black Onyx or Dyed Agate Node
Cryptocrystalline Quartz (SiO2)
Agate (Yellow Moss Agate)
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Banded Agate (Lake Superior Agate style)
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
Snakeskin Agate
Cryptocrystalline Quartz (SiO2)
Green Agate
Cryptocrystalline Quartz (SiO2)
Fairburn Agate
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Black Onyx
Cryptocrystalline Quartz (SiO2)
Blue Onyx (Agate)
Cryptocrystalline Quartz (SiO2)
Blue Agate Geode (Dyed)
Cryptocrystalline Quartz (SiO2)
Agate (specifically a Thunderegg/Agate Nodule)
Cryptocrystalline Quartz (SiO2)
Onyx (beads)
SiO2 (Cryptocrystalline Quartz)
Agate
Cryptocrystalline Quartz (SiO2)
Lake Superior Agate
Cryptocrystalline Quartz (SiO2)
Agate
Cryptocrystalline Quartz (SiO2)
Agate
Chalcedony (cryptocrystalline quartz)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Black Onyx
Cryptocrystalline Quartz (SiO2)