Coquina
Bioclastic Limestone
sedimentary
Category
Anthropogenic Specimen (Man Made Material)
Browse anthropogenic specimen (man made material) specimens identified by the Rock Identifier community.
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Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Tumbled serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄
metamorphic
Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled blue chalcedony (possibly blue agate)
Microcrystalline quartz, SiO₂; chalcedony variety
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Kidney Stone
Calcium oxalate, uric acid, struvite, or cystine
mineral
Chert (Flint Arrowhead)
Silicon Dioxide (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Gold (Elemental Metal)
Gold (Au)
Mineral
Tumbled greenstone, likely nephrite jade
Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
metamorphic
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Likely flint pebble (possibly a worked flint fragment)
Microcrystalline quartz (chalcedony), SiO₂; commonly called flint
sedimentary
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Sandstone
Arenite
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Yooperlite (fluorescent syenite)
Syenite containing fluorescent sodalite, chiefly Na₈(Al₆Si₆O₂₄)Cl₂
igneous
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Yellow/Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Turquoise-style beaded bracelet
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; possibly dyed or composite beads
mineral
Polished jasper pebble
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions
mineral
Blue glassy cabochon, likely blue quartz or synthetic glass
Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive
gemstone
Seven Chakra Bonded Stone
Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz
metamorphic