Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
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Heart-shaped faceted gemstone pendant
Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones
gemstone
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Botryoidal chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Multicolored beryl gemstone bracelet
Beryl, Be₃Al₂Si₆O₁₈; likely mixed aquamarine, morganite, heliodor, and green beryl beads
gemstone
Carnelian cabochon pendant
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Polished black stone pendant
Likely black obsidian or black tourmaline; exact identification is uncertain from the photograph
mineral
Chert (Jasper/Flint)
Silicon Dioxide (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
Turquoise-style beaded bracelet
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads
mineral
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)
Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Chert (often called Flint in archaeological contexts)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
White cabochon gemstone, likely milky chalcedony or opalite
Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass
gemstone
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Mineral (Organic)