Rock Identifier

Category

Mineral (Chalcedony)

Browse mineral (chalcedony) specimens identified by the Rock Identifier community.

Onyx (Black Onyx) (Silicon Dioxide (SiO2)) — mineral

Onyx (Black Onyx)

Silicon Dioxide (SiO2)

Agate Geode (Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals) — mineral

Agate Geode

Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals

Bloodstone (Heliotrope) (Silicon Dioxide (SiO2) with iron silicate and iron oxide inclusions) — Mineral

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with iron silicate and iron oxide inclusions

Agate Geode / Nodular Chalcedony (Silicon Dioxide (SiO2) with impurities) — mineral

Agate Geode / Nodular Chalcedony

Silicon Dioxide (SiO2) with impurities

Purple Dyed Agate Geode (Banded Chalcedony) (Silicon Dioxide (SiO2) - variety: Agate) — mineral

Purple Dyed Agate Geode (Banded Chalcedony)

Silicon Dioxide (SiO2) - variety: Agate

Jasper (brecciated or orbicular variety) (Silicon dioxide (SiO2) with iron oxide inclusions) — sedimentary/mineral

Jasper (brecciated or orbicular variety)

Silicon dioxide (SiO2) with iron oxide inclusions

sedimentary/mineral

Chalcedony (Common Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

Druzy Quartz (on Chalcedony/Agate base) (Silicon Dioxide (SiO2)) — mineral

Druzy Quartz (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

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

Chert / Chalcedony

Silicon Dioxide (SiO2)

Heliotrope (Bloodstone) (Silicon dioxide (SiO2) with inclusions) — mineral

Heliotrope (Bloodstone)

Silicon dioxide (SiO2) with inclusions

Banded Agate (specifically Carnelian Agate) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Agate (Turtle Carving) (Agate (Cryptocrystalline variety of Silica, SiO2)) — mineral

Agate (Turtle Carving)

Agate (Cryptocrystalline variety of Silica, SiO2)

Red Jasper (Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)) — mineral

Red Jasper

Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)

Dendritic Agate (Tumbled) (Silicon Dioxide (SiO2) with inclusions) — mineral

Dendritic Agate (Tumbled)

Silicon Dioxide (SiO2) with inclusions

Green Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Green Jasper

Jasper (Silicon Dioxide, SiO2)

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

Yellow Quartz (Chalcedony)

Quartz / Chalcedony (Silicon Dioxide, SiO2)

Yellow Jasper / Chert (Silicon Dioxide (SiO2) with Goethite or Limonite inclusions) — sedimentary

Yellow Jasper / Chert

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Quartz (specifically a water-worn Quartzite or Chalcedony pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically a water-worn Quartzite or Chalcedony pebble)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide)) — mineral

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Red Jasper (Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

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

Petrified Wood

Silicified Wood (primarily SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Tree Agate (Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides) — mineral

Tree Agate

Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides

Green Chalcedony (likely Chrysoprase or Green Onyx) (Silicon Dioxide (SiO2) with trace nickel or chromium inclusions) — mineral

Green Chalcedony (likely Chrysoprase or Green Onyx)

Silicon Dioxide (SiO2) with trace nickel or chromium inclusions

Red Jasper (Opaque Chalcedony) (Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions) — mineral

Red Jasper (Opaque Chalcedony)

Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions

Jasper (Green) (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper (Green)

Silicon Dioxide (SiO2) with impurities

Black Onyx (Silicon Dioxide (SiO2) with carbon impurities) — mineral

Black Onyx

Silicon Dioxide (SiO2) with carbon impurities

Moss Agate (Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)) — mineral

Moss Agate

Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)

Tree Agate (Silicon Dioxide (SiO2) with Dendritic Inclusions) — Mineral

Tree Agate

Silicon Dioxide (SiO2) with Dendritic Inclusions

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

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood (Silicified Wood (primarily SiO2 - Silicon Dioxide)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Carnelian (Carnelian (Silicon Dioxide - SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Tree Agate (Dendritic Agate (Silicon Dioxide - SiO2)) — mineral

Tree Agate

Dendritic Agate (Silicon Dioxide - SiO2)

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

Brown Jasper (Chert)

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Fancy Jasper (Silicon Dioxide (SiO2) with iron and organic inclusions) — sedimentary

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Yellow Jasper (within host rock) (Silicon Dioxide (SiO2) with iron hydroxides (Goethite)) — sedimentary

Yellow Jasper (within host rock)

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

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

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

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

Botryoidal Chalcedony (Agate)

Silicon Dioxide (SiO2)

Agate (Grey Agate Slice) (Microcrystalline Quartz (SiO2)) — mineral

Agate (Grey Agate Slice)

Microcrystalline Quartz (SiO2)

Banded Calcite (often commercially called Mexican Onyx) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Banded Calcite (often commercially called Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)