Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Category
Mineralological Variety
Browse mineralological variety specimens identified by the Rock Identifier community.
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Milky Quartz
Silicon dioxide (SiO2)
mineral
Shale
Argillite / Shaly Mudstone
sedimentary
Chert (Quartz Variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Polished brecciated jasper (likely)
Microcrystalline quartz, SiO₂, with iron-oxide-rich brown fragments and pale silica
mineral
Agate
SiO2 (Silicon dioxide, cryptocrystalline quartz)
mineral
Polished jasper pebble
Microcrystalline quartz (chalcedony), usually with iron-oxide impurities
mineral
Agate and Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
sedimentary mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Flint (chert)
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Polished brecciated jasper
Silica-rich microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide staining
metamorphic
Coarse-grained Granite
Granitoid (Felsic Plutonic Rock)
igneous
Chert (Jasper/Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled orange-and-white jasper or brecciated chalcedony
Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper; exact variety cannot be confirmed from the image
mineral
Satin Spar
Fibrous Gypsum (CaSO4·2H2O)
mineral
Polished orbicular agate (likely ocean jasper)
Microcrystalline quartz, SiO₂; chalcedony with orbicular patterns and possible mineral inclusions
mineral
Polished red jasper (likely brecciated or orbicular jasper)
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Tumbled jasper (likely picture jasper or iron-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides
sedimentary
Riverstone Jasper (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Barite
Barium sulfate (BaSO4)
mineral
Pyrite or Chalcopyrite
Iron sulfide (FeS2) or Copper iron sulfide (CuFeS2)
mineral
Tumbled brown jasper
Microcrystalline quartz (chalcedony), SiO₂; likely jasper
mineral
Small polished purple stone, likely amethyst
Amethyst, purple variety of quartz (SiO₂)
gemstone
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
mineral
Yellow jasper carving
Jasper, an opaque microcrystalline variety of quartz (SiO₂), shaped as a butterfly
gemstone
Agate
Agate (Chalcedony), SiO2
Mineral
Raw amethyst
Quartz, SiO₂; purple coloration from trace iron and irradiation
mineral
Amber-colored Jasper
Silicon Dioxide (SiO2)
sedimentary
Emerald (green gemstone in a jewelry setting)
Beryl, Be₃Al₂(SiO₃)₆; green color commonly from chromium and/or vanadium
gemstone
Tumbled brown agate (likely carnelian/chalcedony)
Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained
mineral
Polished orange agate (likely carnelian)
Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian
mineral
Jasper
SiO2 (Cryptocrystalline quartz)
mineral
Red jasper (likely polished/tumbled)
Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite
mineral
Polished brown-and-cream jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Polished brown jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic