Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
View all →
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Clear quartz crystal point
Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal
mineral
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Citrine quartz crystal cluster
Quartz, SiO₂; likely iron-colored citrine, possibly heat-treated amethyst
mineral
Strawberry Quartz (Lepidocrosite/Hematite-Included Quartz)
Quartz (Silicon Dioxide) with Lepidocrosite or Hematite inclusions (SiO2 + Fe2O3 · nH2O)
mineral
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Smoky Quartz
Silicon dioxide with aluminum impurities (SiO2)
mineral
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Quartz (Milky/Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Amethyst quartz cluster
Quartz, silicon dioxide (SiO₂), purple variety amethyst
mineral
Greenschist / Greenstone
Greenschist facies metabasite
metamorphic
Amethyst druzy geode slice
Quartz, SiO₂, purple variety (amethyst), with likely chalcedony/banded agate
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
Green aventurine (probable)
Quartz variety, SiO₂, colored by fuchsite or other mica inclusions
mineral
Druzy quartz geode
Quartz, silicon dioxide (SiO₂), microcrystalline druzy coating
mineral
Smoky Quartz
Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)
mineral
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Green Quartz (Prasiolite variant or Aventurine)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled quartz pebble
Quartz (SiO₂), likely milky or iron-stained quartz
mineral
Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dendritic jasper/chalcedony
Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites
mineral
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Sandstone
Arenite
sedimentary
Polished green agate/chalcedony
Microcrystalline quartz (SiO₂), likely chrysoprase- or moss-agate-like chalcedony
mineral
Cullet (Slag Glass)
Amorphous Silica (Industrial byproduct)
mineraloid
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline quartz (SiO2)
sedimentary
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Sandstone (Arkose/Quartzose)
Arenite (SiO2 based clastic rock)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Beach Pebble Quartzite / Chalcedony Pebble
Silicon Dioxide (SiO2)
metamorphic
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral