Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Volcanic)
Browse sedimentary (volcanic) specimens identified by the Rock Identifier community.
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Red Jasper
Silicon dioxide / Quartz (SiO2 (+Fe2O3))
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Carnelian Agate
Silicon dioxide (SiO2) - variety of Chalcedony
mineral
Carnelian
Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities
mineral
Mixed river stones and gravel
Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate
igneous, sedimentary, metamorphic
Chert (and Fossilized Brachiopod shell)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper and Agate (Polychrome Jasper / Mookaite variety)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Gold-bearing Quartz / Auriferous River Rock
Lode Gold in Quartz Matrix (SiO2 + Au)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon dioxide (Chalcedony variety)
sedimentary
Yellow Jasper
Quartz (Silicon Dioxide, SiO2 with impurities)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Quartz (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian type)
Silicon Dioxide (SiO2)
mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Agate
Agate (Silicon Dioxide, SiO2)
sedimentary
Agate
Chalcendony (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Chocolate Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
mineral
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Tumbled jasper, likely red/brown jasper
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
metamorphic
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Chalcedony (Agate and Carnelian varieties)
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Rounded river cobble, likely weathered sandstone or siltstone
Quartz-rich clastic sedimentary rock; exact identification requires a fresh surface and testing
sedimentary
Dendritic Jasper (Bumblebee like Agate)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Picture Jasper
Opaque microcrystalline quartz (SiO2 with iron oxide impurities)
sedimentary