Tumbled brown-and-cream stone, likely jasper or chert
Microcrystalline quartz (SiO₂), probably jasper/chert; exact identification requires testing
mineral
Category
Sedimentary Rock (Technically A Variety Of Chalcedony)
Browse sedimentary rock (technically a variety of chalcedony) specimens identified by the Rock Identifier community.
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Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Likely banded agate or chalcedony
Microcrystalline quartz (SiO₂), possibly iron-stained agate
gemstone
Ocean Jasper
Orbicular Quartz (SiO2)
Mineral
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (CaSO4·2H2O)
mineral
Blue Banded Agate (Dyed)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), likely jasper/chalcedony
mineral
Tumbled banded agate
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other trace-coloring inclusions
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
gemstone
Tumbled yellow jasper or chalcedony
Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Agate (specifically Carnelian Agate slice)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Dalmation Stone (frequently called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock
igneous
Red Jasper
Chalcedony (SiO2 with iron oxide impurities)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO₂)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Bloodstone (Heliotrope)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite or Chlorite
mineral
Jasper
Chalcedony (SiO2)
mineral
Chalcedony / Agate Pebble
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chalcedony (Agate)
Chalcedony (Cryptocrystalline Quartz, SiO2)
mineral
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Howlite and Tree Agate
Calcium Borosilicate Hydroxide (Howlite) and Silicon Dioxide (Agate/Quartz)
mineral
Geode Nodule Fragment
Quartz / Chalcedony Nodule
sedimentary
Polished agate geode
Chalcedony (microcrystalline SiO₂), commonly banded agate with drusy quartz and possible iron-oxide inclusions
mineral
Polished red jasper pebble
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Jasper
Chalcedony (SiO2)
Sedimentary/Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Kambaba Jasper (Crocodile Jasper)
Rhyolite containing Fossilized Cyanobacteria (Stromatolite)
sedimentary
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) and chalcedony with a quartz vein
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with quartz infill
sedimentary
Agate (specifically Waterline or Onyx-type Agate)
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Jasper
SiO2 (Cryptocrystalline quartz)
mineral
Polished red jasper
Jasper, a microcrystalline variety of quartz (mostly SiO₂)
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral