Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
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Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Silica (SiO2) quartzite
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Heart-shaped faceted gemstone pendant
Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished black stone sphere (likely black basalt or black tourmaline)
Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone
igneous
Carnelian cabochon pendant
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Faceted colored gemstones, likely synthetic corundum or glass imitations
Not identifiable from the image; possible synthetic corundum (Al₂O₃)
gemstone
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Polished black stone pendant
Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Botryoidal chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony
mineral
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Sea glass (likely green bottle glass)
Human-made soda-lime silicate glass; not a natural mineral or geological rock
mineral
Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)
Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli
gemstone
Multicolored beryl gemstone bracelet
Beryl, Be₃Al₂Si₆O₁₈; likely mixed aquamarine, morganite, heliodor, and green beryl beads
gemstone
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Turquoise-style beaded bracelet
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary