Polished carnelian/chalcedony pebble
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony
gemstone
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 →
Agate (Carnelian Agate with Quartz Matrix)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Jasper (specifically Chert/Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Banded Agate (Chert / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Polished brecciated jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia
mineral
Agate (within host rock)
Agate (Quartz variety SiO2)
mineral
Botryoidal Chalcedony
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Blue chalcedony cabochon (probable)
Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)
gemstone
Yellow Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
mineral
Agate (Carnelian-Blue Agate mix)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Lace Agate (specifically Red Lace Agate)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
Mineral
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Botryoidal Chalcedony with Calcite
Chalcedony (SiO2 with accessory minerals, likely CaCO3)
Mineral
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Red Jasper with Quartz
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide with Limonite/Goethite inclusions (SiO2)
sedimentary
Banded Agate (specifically Lake Superior Agate style)
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Tumbled brown jasper (likely iron-rich chalcedony)
Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Chert (often called Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (with Quartz veins)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Polished/tumbled jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities
mineral
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Banded Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Tumbled carnelian (likely chalcedony)
Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony
gemstone
Jasper
Silicon Dioxide (SiO2)
mineral
Pink chalcedony (pink agate-like quartz)
Microcrystalline quartz, SiO₂ (chalcedony; likely iron-bearing)
mineral
Tumbled yellow-brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic