Rock Identifier

Category

Mineral (Specifically A Variety Of Chalcedony, Which Is A Cryptocrystalline Quartz)

Browse mineral (specifically a variety of chalcedony, which is a cryptocrystalline quartz) specimens identified by the Rock Identifier community.

Dyed Blue Agate (Silicon Dioxide (SiO2) with artificial cobalt-based dye) — mineral

Dyed Blue Agate

Silicon Dioxide (SiO2) with artificial cobalt-based dye

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

Beach Agate (Chalcedony)

Silicon Dioxide (SiO2)

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

Red Jasper

Jasper (Silicon Dioxide, SiO2)

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

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Banded Calcite (Cave Onyx) (Calcium Carbonate (CaCO3)) — sedimentary

Banded Calcite (Cave Onyx)

Calcium Carbonate (CaCO3)

Jasper (Willow Creek/Desert style) (Silicon Dioxide (SiO2) with iron and clay impurities) — sedimentary

Jasper (Willow Creek/Desert style)

Silicon Dioxide (SiO2) with iron and clay impurities

Carnelian (Carnelian (a variety of Chalcedony, SiO2)) — mineral

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Yellow Chalcedony (Agate or Citrine Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Agate or Citrine Quartz)

Silicon Dioxide (SiO2)

Agate Geode (Chalcedony (SiO2 - Silicon Dioxide)) — sedimentary (secondary mineral formation)

Agate Geode

Chalcedony (SiO2 - Silicon Dioxide)

sedimentary (secondary mineral formation)

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

Black Onyx

Onyx (Silicon Dioxide, SiO2)

Quartz (likely Chalcedony or Chert) (Silicon Dioxide (SiO2)) — mineral

Quartz (likely Chalcedony or Chert)

Silicon Dioxide (SiO2)

Agate (Water-Worn Pebble) (Silicon Dioxide (SiO2) - Chalcedony) — mineral

Agate (Water-Worn Pebble)

Silicon Dioxide (SiO2) - Chalcedony

Jasper (Silicon dioxide, SiO2) — Mineral

Jasper

Silicon dioxide, SiO2

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

Grey Chalcedony (Agate)

Silicon Dioxide (SiO2)

Green Calcite (often commercially called Green Onyx) (Calcium Carbonate (CaCO3)) — Mineral

Green Calcite (often commercially called Green Onyx)

Calcium Carbonate (CaCO3)

Smoky Quartz (SiO2 (Silicon Dioxide)) — Mineral

Smoky Quartz

SiO2 (Silicon Dioxide)

Labradorite (Labradorite ((Ca, Na)(Al, Si)4O8)) — mineral

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Diopside (likely Chromian Diopside) (Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.) — mineral

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Common Opal/Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Chalcedony)

Microcrystalline Quartz (SiO2)

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

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Chalcedony (Agate/Carnelian) (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony (Agate/Carnelian)

Cryptocrystalline Quartz (SiO2)

Amethyst Quartz (Chevron Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst Quartz (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Tumbled Green Jasper (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Tumbled Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

K2 Jasper (K2 Granite) (Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)) — igneous

K2 Jasper (K2 Granite)

Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)

Onyx Marble (also commonly called Onyx) (Calcite (CaCO3), often with other mineral impurities) — Sedimentary Rock (specifically a type of Travertine)

Onyx Marble (also commonly called Onyx)

Calcite (CaCO3), often with other mineral impurities

Sedimentary Rock (specifically a type of Travertine)

Blue Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Blue Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate) (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment) (Quartz (SiO₂)) — Mineral

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Fancy Jasper (Silicon Dioxide (SiO2) with impurities) — mineral

Fancy Jasper

Silicon Dioxide (SiO2) with impurities

Ferruginous Quartz (Iron-stained Quartz) (Silicon Dioxide (SiO2) with Hematite/Goethite inclusions) — mineral

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Blue Lace Agate (Chalcedony (SiO2) with trace impurities) — mineral

Blue Lace Agate

Chalcedony (SiO2) with trace impurities

Citrine (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine

Silicon Dioxide (SiO2) with iron impurities

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Jasper (Silicon Dioxide (SiO2)) — mineral

Jasper

Silicon Dioxide (SiO2)