Rock Identifier

Category

Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

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

Chalcedony (Moonstone-like Agate) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Moonstone-like Agate)

Silicon Dioxide (SiO₂)

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

Chalcedony (Agate/Chert)

Silicon Dioxide (SiO2)

Iron-Stained Quartzite (Recrystallized Meta-Quartzite (primarily SiO2)) — metamorphic

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Ferruginous Quartzite (Chert) (Quartzite with Iron inclusions (SiO2 + Fe2O3)) — metamorphic

Ferruginous Quartzite (Chert)

Quartzite with Iron inclusions (SiO2 + Fe2O3)

Banded Agate (River-worn Pebble) (Cryptocrystalline Silicon Dioxide (SiO2)) — sedimentary

Banded Agate (River-worn Pebble)

Cryptocrystalline Silicon Dioxide (SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

Botryoidal Chalcedony (Desert Rose / Grape Agate variant) (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony (Desert Rose / Grape Agate variant)

Silicon Dioxide (SiO2)

Quartz (Quartz (SiO₂)) — Mineral

Quartz

Quartz (SiO₂)

Chalcedony in Host Rock (Silicon Dioxide (SiO2)) — mineral

Chalcedony in Host Rock

Silicon Dioxide (SiO2)

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

Yellow Chert or Jasper

Silicon Dioxide (SiO2)

Chalcedony (Chalcedony (SiO2)) — mineral

Chalcedony

Chalcedony (SiO2)

Chert Concretion (with typical hematite/limonite staining) (Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)) — sedimentary

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Black Onyx (Silicon Dioxide (SiO2)) — mineral

Black Onyx

Silicon Dioxide (SiO2)

Quartzite with Sandstone/Iron staining (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite with Sandstone/Iron staining

Metamorphic Quartzite (SiO2)

Quartz (Milky Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Chert (Flint variety)

Silicon Dioxide (SiO2)

Chert (and Flint) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (and Flint)

Microcrystalline Silica (SiO2)

Hag Stone (Calcareous sedimentary rock (often Chert, Flint, or Limestone)) — sedimentary

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

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

Chert (and Chalcedony)

Silicon Dioxide (SiO2)

Blue Lace Agate (Heat-treated/Crackle Quartz variety) (Silicon Dioxide (SiO2)) — mineral

Blue Lace Agate (Heat-treated/Crackle Quartz variety)

Silicon Dioxide (SiO2)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Chert (varietal Flint)

Silicon Dioxide (SiO2)

Carnelian Agate (Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities) — mineral

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

Chalcedony (Botryoidal/Tumbled Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Botryoidal/Tumbled Agate)

Silicon Dioxide (SiO2)

Agate (Carnelian-like) (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

Quartz Veined Rock (Likely Graywacke or Quartzite) (Silicon Dioxide (SiO2) veins in Metasedimentary matrix) — metamorphic

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

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

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Turquoise (Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)) — mineral

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Yellow Quartz (Citrine/Yellow Jasper mix) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Chalcedony (Agatized Coral / Rough Chalcedony Node) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agatized Coral / Rough Chalcedony Node)

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2) / Rock Crystal) — mineral

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Yellow Quartz Pebble (Quartz (Silicon Dioxide - SiO2)) — mineral

Yellow Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

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

Chert (Flint variety)

Silicon Dioxide (SiO2)

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

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Chert (varieties include Flint and Mudstone) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (varieties include Flint and Mudstone)

Microcrystalline Silica (SiO2)

Quartz (Milky or Grainy Variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky or Grainy Variety)

Silicon Dioxide (SiO2)

Chalcedony (Silicon Dioxide (SiO₂)) — mineral

Chalcedony

Silicon Dioxide (SiO₂)

Chert (Fossiliferous) (Silicon dioxide (SiO2)) — sedimentary

Chert (Fossiliferous)

Silicon dioxide (SiO2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Gray Chert) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Chert (and/or Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and/or Flint)

Silicon Dioxide (SiO2)