Rock Identifier

Category

Organic Crystal (Mineraloid)

Browse organic crystal (mineraloid) specimens identified by the Rock Identifier community.

Chert / Flint (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert / Flint

Chert (Cryptocrystalline Quartz, SiO2)

Chert (variations include Flint or Jasper) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Tan or Buffer variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Tan or Buffer variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Brown Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Brown Chert

Microcrystalline Quartz (SiO2)

Chert / Flint (Microcrystalline or cryptocrystalline quartz (SiO2)) — sedimentary

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Dendritic Limestone (Calcite with Manganese Oxide (Manganese Dendrites)) — sedimentary

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Chert Pebble (Microcrystalline quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline quartz (SiO2)

Quartz (Chert/Chalcedony variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Chert (with Epidote/Quartz veining) (Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions) — sedimentary

Chert (with Epidote/Quartz veining)

Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Iron-stained) (Chert (SiO2)) — sedimentary

Chert (Iron-stained)

Chert (SiO2)

Chert (Jasper type) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper type)

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Chert (Yellow Jasper variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Red Sandstone (Sandstone (Quartz Arenite / Arkose with Hematite cement)) — sedimentary

Red Sandstone

Sandstone (Quartz Arenite / Arkose with Hematite cement)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Chert (Arrowhead Fragment) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (and Flint) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (and Flint)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Nodular) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Nodular)

Microcrystalline Silica (SiO2)

Jasper (Silicon Dioxide (SiO2)) — mineral

Jasper

Silicon Dioxide (SiO2)

Chert (Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Chalcedony)

Silicon Dioxide (SiO2)

Chert (Flint) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (varieties include Flint and Jasper) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint Pebble) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Chert (specifically Flint or Common Chert) (Silicon dioxide (SiO2) - Microcrystalline quartz) — sedimentary

Chert (specifically Flint or Common Chert)

Silicon dioxide (SiO2) - Microcrystalline quartz

Chert (Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Yellow Chert (Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Yellow Chert (Chalcedony)

Microcrystalline Quartz (SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Chert (Black Chert / Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Black Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina / Shell Limestone (Coquina (Bioclastic Limestone)) — sedimentary

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Chert (containing Quartz veins) (Chert (SiO2)) — sedimentary

Chert (containing Quartz veins)

Chert (SiO2)

Black Jasper (Black Onyx substitute) (Silicon Dioxide (SiO2) with carbonaceous impurities) — sedimentary (microcrystalline quartz)

Black Jasper (Black Onyx substitute)

Silicon Dioxide (SiO2) with carbonaceous impurities

sedimentary (microcrystalline quartz)

Chert (Green River Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Green River Chert)

Microcrystalline Quartz (SiO2)

Concretionary Sandstone (Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)) — sedimentary

Concretionary Sandstone

Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)

Amber (Fossilized Tree Resin (Succinate)) — mineral

Amber

Fossilized Tree Resin (Succinate)

Moss Agate / Chalcedony (Silicon Dioxide (SiO2)) — mineral

Moss Agate / Chalcedony

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Pyrite in Shale (Iron Sulfide (FeS2) in Sedimentary Matrix) — mineral

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Chert (Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)