Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
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.
Learn about Mineral (Specifically A Variety Of Chalcedony, Which Is A Cryptocrystalline Quartz) in the encyclopedia
View all →
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Brown Agate
Silicon Dioxide (SiO2)
mineral
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate
Silicon Dioxide (SiO2) - Chalcedony / Quartz
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) containing Iron Oxide impurities
sedimentary
Polished River Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
sedimentary
Brown Agate
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Polished pink banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony (likely dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Yellow Jasper
Silicon dioxide, SiO2
mineral
Banded Agate with Druzy Quartz
Agate (Silicon Dioxide - SiO2)
mineral
Likely yellow chalcedony or citrine cabochon
Cryptocrystalline quartz (chalcedony), SiO₂; alternatively quartz variety citrine
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Poppy Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Pink Tumbled Agate
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled brown jasper
Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Tumbled blue chalcedony (likely blue quartz/chalcedony)
Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated
mineral
Jasper with Agate Inclusions
Silicon Dioxide (SiO2) - variety of Quartz/Chert
sedimentary
Tiger's Eye
Tiger's Eye (a variety of Chalcedony, which is cryptocrystalline quartz). Chemical Formula: SiO2 with inclusions of crocidolite fibers.
Mineral
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Mineral
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Flint / Chert Pebble
Microcrystalline quartz (SiO2)
sedimentary
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Agate with Quartz Druzy
Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline varieties
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Polished/tumbled brown jasper or iron-rich chert
Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite
mineral
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2 with inclusions)
mineral
Chalcedony (Dyed Agate and Citrine-style Quartz)
Silicon Dioxide (SiO2)
gemstone
Tumbled pink quartz (likely rose quartz)
Quartz, silicon dioxide (SiO₂), pink variety commonly called rose quartz
mineral
Moss Agate and Druzy Quartz Carving
Cryptocrystalline Silica (SiO2) with impurities
mineral