Chert or flint
Microcrystalline quartz (SiO₂), likely chalcedony-rich chert
sedimentary
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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Polished orange jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Blue Lace Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Banded Agate (with small Geode cavity)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Polished jasper, likely ocean jasper or brecciated jasper
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other inclusions
mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
mineral
Chalcedony (Agate / Chert)
Silicon Dioxide (SiO2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Likely tumbled yellow jasper or iron-rich chert
Microcrystalline quartz (SiO₂), colored by iron oxides
mineral
Tumbled brecciated jasper
Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide-rich matrix or veining
mineral
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Yellow Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Raw selenite (gypsum)
Gypsum, CaSO₄·2H₂O; translucent variety selenite
mineral
Blue Chalcedony (likely dyed)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Polished brecciated jasper
Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay-mineral inclusions
gemstone
Druzy Agate (specifically Black Druzy Agate)
Silicon Dioxide (SiO2)
mineral
Red jasper (likely polished/tumbled)
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
mineral
Tumbled brecciated jasper
Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony
mineral
Polished red jasper pebble
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Green Jasper / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Tumbled jasper (likely brecciated or red jasper)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides
mineral
Dalmation Jasper (Dalmation Stone)
Perthitic feldspar-quartz-amphibole rock
igneous
Tumbled yellow jasper (probable)
Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions
mineral
Tree Agate (Dendritic Agate)
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Ocean Jasper (Orbicular Jasper)
Spherulitic Chalcedony (SiO2)
igneous
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Dalmation Jasper
Dalmation Stone (perthitic feldspar with arfvedsonite)
igneous
Botryoidal Chalcedony (Quartz Var.)
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper (or Dalmatian Stone)
Dalmatian Stone (A peralkaline felsite composed of feldspar, quartz, and sodic amphibole)
igneous
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Petrified wood
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing organic tissue
fossil
Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2)
sedimentary
Agate
SiO2
mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary