Rock Identifier

Category

Sedimentary (Cryptocrystalline Quartz)

Browse sedimentary (cryptocrystalline quartz) specimens identified by the Rock Identifier community.

Sandstone (Quartzose Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (Stream-rounded) (Arenite (SiO2 based)) — sedimentary

Sandstone (Stream-rounded)

Arenite (SiO2 based)

Quartz Mica Schist (Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)) — metamorphic

Quartz Mica Schist

Mica-Quartz Schist (Chemical: SiO2 + KAl2(AlSi3O10)(OH)2)

Clear Quartz Crystal Cluster (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Amethyst (Quartz (SiO2) variety) — Mineral

Amethyst

Quartz (SiO2) variety

Shale with Vein Infillings (Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.) — Sedimentary Rock

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Sedimentary Rock

Sandstone (likely Ferruginous) (Sandstone (SiO2 with iron oxides)) — sedimentary

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

Agate Geode (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Agate Geode

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amethyst (Geode/Druzy) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Geode/Druzy)

Silicon Dioxide (SiO2) with iron impurities

Quartz Geode (Crystalline Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Geode

Crystalline Quartz (Silicon Dioxide, SiO2)

Red Jasper (Jasper (Silicon Dioxide, SiO2 with Iron oxide inclusions)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron oxide inclusions)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Red Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Greywhacke (River Pebble) (Graywacke (immature sandstone)) — sedimentary

Greywhacke (River Pebble)

Graywacke (immature sandstone)

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — Sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper (Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Sandstone (Arenite (primarily composed of SiO2)) — sedimentary

Sandstone

Arenite (primarily composed of SiO2)

Granitic Gneiss (Gneiss (containing Potassium Feldspar and Quartz)) — metamorphic

Granitic Gneiss

Gneiss (containing Potassium Feldspar and Quartz)

Blue Lace Agate (Silicon Dioxide (SiO2) - Chalcedony / Quartz) — sedimentary

Blue Lace Agate

Silicon Dioxide (SiO2) - Chalcedony / Quartz

Red Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz

Silicon Dioxide (SiO2)

Yellow Jade (Yellow Chalcedony/Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Jade (Yellow Chalcedony/Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Druzy) (Crystalline Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Druzy)

Crystalline Silicon Dioxide (SiO2)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Blue Calcite (Calcite (CaCO3)) — mineral

Blue Calcite

Calcite (CaCO3)

Sandstone (Quartzose Sandstone Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose Sandstone Pebble)

Arenite (primarily SiO2)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx') (Calcite (Calcium Carbonate, CaCO3)) — Sedimentary

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')

Calcite (Calcium Carbonate, CaCO3)

Gneiss (specifically a water-worn pebble) (Gneiss) — metamorphic

Gneiss (specifically a water-worn pebble)

Gneiss

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Sandstone (lithified sand)) — sedimentary

Sandstone

Sandstone (lithified sand)

Jasper (Jasper (Silicon Dioxide) - SiO2) — sedimentary

Jasper

Jasper (Silicon Dioxide) - SiO2

Greywacke (River Pebble with Quartz Veins) (Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)) — sedimentary

Greywacke (River Pebble with Quartz Veins)

Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)

Jasper (Silicon dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz Druzy Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy Geode

Silicon Dioxide (SiO2)

Druzy Quartz Geode (Vug) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Quartz River Cobble (Silicon Dioxide (SiO2)) — mineral

Quartz River Cobble

Silicon Dioxide (SiO2)

Green Calcite (Onyx Marble) (Calcium Carbonate (CaCO3)) — mineral

Green Calcite (Onyx Marble)

Calcium Carbonate (CaCO3)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony) (Chert (microcrystalline quartz)) — Metamorphic Rock

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Metamorphic Rock