Rock Identifier

Category

Mineral (Chalcedony)

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

Learn about Mineral (Chalcedony) in the encyclopedia

Chalcedony

Chrome Chalcedony

Chrome Chalcedony

Blue Chalcedony

Blue Chalcedony

Gem Silica

Plume Agate

Landscape Agate

Landscape Agate

Chrysoprase

Sard

Prase

Glauconite

Sagenite Agate

Grape Agate

Carnelian (Chalcedony) (SiO2 (Silicon Dioxide with iron oxide inclusions)) — gemstone

Carnelian (Chalcedony)

SiO2 (Silicon Dioxide with iron oxide inclusions)

Chalcedony Pebble (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Chalcedony (River or Beach Pebbles) (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Chalcedony (River or Beach Pebbles)

Chalcedony (Silicon Dioxide, SiO2)

Brecciated Jasper (Silicon Dioxide (SiO2) with iron impurities) — sedimentary

Brecciated Jasper

Silicon Dioxide (SiO2) with iron impurities

Banded Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Agate

Cryptocrystalline Quartz (SiO2)

Agate (Silicon Dioxide (SiO2)) — sedimentary

Agate

Silicon Dioxide (SiO2)

Grey Chalcedony (Silicon Dioxide (SiO2)) — mineral

Grey Chalcedony

Silicon Dioxide (SiO2)

Dendritic Quartz (Silicon Dioxide (SiO2) with Manganese Oxide inclusions) — mineral

Dendritic Quartz

Silicon Dioxide (SiO2) with Manganese Oxide inclusions

Blue chalcedony cabochon (probable) (Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)) — gemstone

Blue chalcedony cabochon (probable)

Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)

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

Chalcedony / Agate

Silicon Dioxide (SiO2)

Yellow Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Yellow Chalcedony

Cryptocrystalline Quartz (SiO2)

Carnelian (orange chalcedony) (Microcrystalline quartz, SiO₂; chalcedony colored mainly by iron oxides) — gemstone

Carnelian (orange chalcedony)

Microcrystalline quartz, SiO₂; chalcedony colored mainly by iron oxides

Bloodstone (Heliotrope (Cryptocrystalline Quartz, SiO2)) — mineral

Bloodstone

Heliotrope (Cryptocrystalline Quartz, SiO2)

Jasper (Silicon dioxide (SiO2)) — mineral

Jasper

Silicon dioxide (SiO2)

Jasper (Silicon dioxide (SiO2)) — mineral

Jasper

Silicon dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Fancy Jasper (Silicon Dioxide (SiO2)) — mineral

Fancy Jasper

Silicon Dioxide (SiO2)

Geode (Quartz / Chalcedony nodule with mineralized cavity) — sedimentary

Geode

Quartz / Chalcedony nodule with mineralized cavity

Chalcedony (likely common gray chalcedony) (Microcrystalline quartz, SiO₂) — mineral

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Polished orbicular jasper (likely ocean jasper) (Silica-rich chalcedony/quartz aggregate with microcrystalline quartz, commonly containing feldspar and iron-oxide inclusions) — mineral

Polished orbicular jasper (likely ocean jasper)

Silica-rich chalcedony/quartz aggregate with microcrystalline quartz, commonly containing feldspar and iron-oxide inclusions

Polished blue-gray agate/geode slice (tentative) (Microcrystalline quartz (chalcedony), SiO₂, possibly with druzy quartz) — mineral

Polished blue-gray agate/geode slice (tentative)

Microcrystalline quartz (chalcedony), SiO₂, possibly with druzy quartz

Blue Quartz (Dumortierite Quartz) (Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)) — metamorphic

Blue Quartz (Dumortierite Quartz)

Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)

Chalcedony on Matrix (Silicon Dioxide (SiO2)) — mineral

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Tumbled brown jasper (Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities) — mineral

Tumbled brown jasper

Jasper, microcrystalline quartz (SiO₂), commonly with iron-oxide impurities

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

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Tumbled chalcedony or quartz (Microcrystalline silica, SiO₂ (likely chalcedony; possibly milky quartz)) — mineral

Tumbled chalcedony or quartz

Microcrystalline silica, SiO₂ (likely chalcedony; possibly milky quartz)

Quartz (Chalcedony/Agate nodule) (Silicon dioxide (SiO2)) — mineral

Quartz (Chalcedony/Agate nodule)

Silicon dioxide (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Chalcedony (likely agate or chert) (Microcrystalline quartz, SiO₂) — mineral

Chalcedony (likely agate or chert)

Microcrystalline quartz, SiO₂

Chalcedony (Agate / Quartz Nodule) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate / Quartz Nodule)

Silicon Dioxide (SiO2)

Chrysocolla in Quartz (Gem Silica) (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)) — mineral

Chrysocolla in Quartz (Gem Silica)

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)

Dendritic Agate (Silicon Dioxide (SiO2) with Manganese/Iron inclusions) — mineral

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron inclusions

Sardonyx Agate Sphere (Cryptocrystalline Quartz (SiO2) with iron oxide inclusions) — mineral

Sardonyx Agate Sphere

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Red jasper (Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides) — mineral

Red jasper

Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides

Red-and-blue jasper (likely ocean jasper or dyed/polished jasper) (Microcrystalline quartz, chiefly SiO₂; jasper is an opaque chalcedony variety colored by iron oxides and other impurities) — mineral

Red-and-blue jasper (likely ocean jasper or dyed/polished jasper)

Microcrystalline quartz, chiefly SiO₂; jasper is an opaque chalcedony variety colored by iron oxides and other impurities

Polished brecciated jasper pebble (Microcrystalline quartz (SiO₂), with iron-oxide inclusions) — mineral

Polished brecciated jasper pebble

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Yellow Jasper (Silicon Dioxide (SiO2) with goethite or iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Jasper / Quartz Pebble (Silicon Dioxide (SiO2) with microcrystalline impurities) — sedimentary

Jasper / Quartz Pebble

Silicon Dioxide (SiO2) with microcrystalline impurities

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

Chert Pebble (Jasper variety)

Silicon Dioxide (SiO2)

Yellow Jasper (Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)) — sedimentary

Yellow Jasper

Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)

Polished orange agate or chalcedony (Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate) — mineral

Polished orange agate or chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate

Yellow Chalcedony (Agate/Carnelian) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)