Polished pink chalcedony (possibly carnelian)
Microcrystalline quartz, SiO₂; chalcedony variety, with exact variety uncertain from the image
mineral
Category
Mineralological Variety
Browse mineralological variety specimens identified by the Rock Identifier community.
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Polished agate (likely moss or plume agate)
Microcrystalline quartz (SiO₂), chalcedony variety; exact variety is uncertain from the photo
mineral
Polished jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other impurities
gemstone
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Peridot (rough olivine crystals)
Olivine, chiefly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄; gem-quality olivine is called peridot
mineral
Faceted green gemstone, possibly peridot
Uncertain from the image; peridot is gem-quality olivine, (Mg,Fe)₂SiO₄
gemstone
Amethyst (rough crystal cluster)
Quartz, SiO₂; purple coloration commonly caused by trace iron and natural irradiation
mineral
Polished orange agate beads
Chalcedony, microcrystalline quartz (SiO₂), commonly sold as agate
mineral
Agate (chalcedony), likely a cut nodule
Agate, a banded variety of microcrystalline quartz (SiO₂); associated iron oxides stain the rough outer matrix.
mineral
Iron-stained quartz
Quartz (SiO₂), likely with iron-oxide staining and possible host-rock inclusions
mineral
Amethyst-bearing quartz cluster
Quartz, SiO₂, with purple amethyst (iron-bearing quartz)
mineral
Red jasper (likely tumbled)
Microcrystalline quartz, chiefly SiO₂, colored red by iron oxides
gemstone
Tumbled amethyst
Amethyst, purple quartz (SiO₂), colored mainly by iron-related defects
gemstone
Tumbled jasper
Microcrystalline quartz (SiO₂), commonly iron-stained chalcedony/jasper
mineral
Milky Quartz/Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled yellow jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Agate
Chalcedony (SiO2)
Mineral
Agate
Cryptocrystalline quartz, SiO2
mineral
Tumbled yellow chalcedony (probable)
Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper
mineral
Sardonyx or Carnelian Agate
Silicon Dioxide (SiO2) with iron impurities
mineral
Red Jasper (Brecciated)
Silicon Dioxide with Iron inclusions (SiO2)
sedimentary
Jasper (Red/Brown)
Microcrystalline Quartz (SiO2) with Iron Oxide inclusions
sedimentary
Tumbled brown jasper
Microcrystalline quartz/chalcedony (SiO₂), commonly iron-oxide stained
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
sedimentary
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Iron Oxide impurities
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Smoky quartz crystal
Quartz, SiO₂ (smoky variety)
mineral
Smoky quartz crystal fragment
Quartz (SiO₂), smoky variety
mineral
Likely smoky quartz
Quartz, SiO₂ (smoky variety)
mineral
Smoky quartz crystal fragment
Quartz (SiO₂), smoky variety
mineral
Likely smoky quartz fragment
Quartz, SiO₂ (smoky variety)
mineral
Smoky quartz
Quartz, SiO₂ (smoky variety)
mineral
Rose quartz
Quartz, SiO₂ (pink variety)
mineral
Milky quartz pebble
Quartz (SiO₂), massive variety
mineral
Polished smoky quartz
Quartz (SiO₂), smoky variety
mineral
Rose quartz
Quartz (SiO₂), pink variety
mineral
Tumbled rose quartz
Quartz (SiO₂), pink variety
mineral
Likely rough smoky quartz
Quartz, SiO₂ (smoky variety)
mineral