Tumbled carnelian (likely)
Chalcedony, microcrystalline quartz (SiO₂), orange-brown variety
gemstone
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is microcrystalline quartz) specimens identified by the Rock Identifier community.
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Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
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)
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Chalcedony (likely brown agate or flint)
Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained
mineral
Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Polished brecciated jasper
Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions
mineral
Jasper Agate (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Jasper (specifically Oolitic or Brecciated Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Chalcedony (Quartz Pebbles)
Silicon Dioxide (SiO2)
mineral
Tumbled pale agate or chalcedony
Microcrystalline quartz (SiO₂), likely agate/chalcedony
mineral
Blue-gray chalcedony (likely agate/jasper fragment)
Microcrystalline quartz, SiO₂ (chalcedony)
mineral
Polished honey/brown agate (likely carnelian chalcedony)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration
mineral
Tumbled blue chalcedony (possibly blue agate)
Microcrystalline quartz, SiO₂; chalcedony variety
mineral
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Banded Calcite (Green Onyx / Onyx-Marble)
Travertine / Calcite (CaCO3)
sedimentary
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2) with trace minerals
mineral
Tumbled brown jasper
Microcrystalline quartz (chalcedony), SiO₂; likely jasper
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chalcedony
Silicon dioxide (SiO2) - Microcrystalline quartz
mineral
Greenstone
Greenschist / Greenstone (contains epidote, chlorite, and actinolite)
metamorphic
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
sedimentary
Tumbled brown agate (likely carnelian/chalcedony)
Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained
mineral
Tumbled carnelian
Chalcedony (microcrystalline quartz), SiO₂; iron-colored variety
gemstone
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Tumbled brown jasper
Microcrystalline quartz/chalcedony (SiO₂), commonly iron-stained
mineral
Yellow Jasper
Chalcedony (SiO2) with goethite or limonite inclusions
sedimentary
Iron-stained chalcedony or jasper
Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
SiO2
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Tumbled chalcedony or quartz pebble
Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image
mineral
Tumbled banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Tumbled chalcedony (likely orange agate/carnelian)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration
mineral
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
sedimentary
Agate (specifically Oco or Banded Agate)
Agate (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Polished brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments
mineral
Jasper (likely brecciated jasper)
Microcrystalline quartz, SiO₂; iron-oxide-stained chalcedony
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - variety Jasper
sedimentary