Tumbled/rounded agate (likely mossy or brecciated chalcedony)
Microcrystalline quartz, SiO₂ (chalcedony/agate)
mineral
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is A Microcrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is a microcrystalline quartz) specimens identified by the Rock Identifier community.
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Jasper
Microcrystalline Quartz (SiO2)
mineral
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂), commonly containing iron-oxide and clay inclusions
mineral
Tumbled orange chalcedony
Chalcedony (microcrystalline quartz, SiO₂), likely orange carnelian
mineral
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Polished banded agate pendant
Agate, a microcrystalline variety of chalcedony (SiO₂)
gemstone
Red Jasper (Siltstone or Chert-based Jasper)
Silicon dioxide with hematite (SiO2 + Fe2O3)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Polished red jasper
Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides
metamorphic
Polished brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and angular mineral fragments
metamorphic
Tumbled brown jasper
Microcrystalline quartz (SiO₂), commonly with iron-oxide impurities
mineral
Polished carnelian
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
mineral
Polished agate pebble
Banded chalcedony, a microcrystalline variety of quartz (SiO₂)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Peach Aventurine
Quartz variety (SiO2 + Hematite/Goethite inclusions)
mineral
Tumbled red-brown stone, likely jasper
Jasper, microcrystalline quartz (SiO₂), probably iron-oxide-bearing chert
mineral
Jasper (specifically Brecciated or Agated Jasper)
Silicon Dioxide (SiO2) - Chalcedony with impurities
Mineral / Sedimentary
Tumbled orange carnelian (likely)
Chalcedony, microcrystalline quartz (SiO₂)
gemstone
Chalcedony (probably agate or common quartz)
Microcrystalline quartz, SiO₂
mineral
Yellow Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Polished brecciated jasper pebble
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Tumbled agate and chalcedony specimens
Microcrystalline quartz (SiO₂), chiefly chalcedony/agate
mineral
Jasper (Red/Brown Variety)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)
sedimentary
Jasper with Agate Inclusions
Silicon Dioxide (SiO2) - variety of Quartz/Chert
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Polished agate/geode slab
Banded chalcedony (microcrystalline quartz, SiO₂), likely with quartz crystals
mineral
Chalcedony (likely agate/chert fragment)
Microcrystalline quartz, SiO₂
mineral
Tumbled blue chalcedony
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Blue chalcedony (likely dyed or coated)
Microcrystalline quartz, SiO₂ (chalcedony)
mineral
Tumbled carnelian (red-orange chalcedony)
Carnelian, cryptocrystalline quartz (SiO₂), a variety of chalcedony
gemstone
Polished red jasper
Jasper, microcrystalline quartz (SiO₂)
mineral
Chalcedony (Quartz Pebbles)
Silicon Dioxide (SiO2)
mineral
Flint
SiO2 (Cryptocrystalline Quartz / Chert)
sedimentary
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Red Jasper (possibly banded Jaspilite)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Tumbled carnelian (red-orange chalcedony)
Carnelian, a microcrystalline variety of quartz; SiO₂
gemstone
Tumbled carnelian (likely)
Chalcedony, microcrystalline quartz (SiO₂), orange-brown variety
gemstone
Polished honey/brown agate (likely carnelian chalcedony)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic