Multicolor quartz bead bracelet
Quartz (silicon dioxide, SiO₂); bead colors may be from different varieties or treated quartz
gemstone
Category
Man Made Material (Constructed)
Browse man made material (constructed) specimens identified by the Rock Identifier community.
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Tumbled brown chalcedony or jasper
Microcrystalline quartz, SiO₂; possibly iron-bearing jasper
mineral
Tourmalinated quartz point
Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions
mineral
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Native Silver
Silver (elemental Ag)
mineral
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Polished rutilated quartz cabochon
Quartz (SiO₂) with rutile inclusions (TiO₂)
gemstone
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)
Quartz, silicon dioxide (SiO₂)
mineral
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Carnelian cabochon
Orange-red variety of chalcedony (microcrystalline quartz), SiO₂
gemstone
Coquina
Biogenic Limestone (Coquina)
sedimentary
Chalk
Calcite (CaCO3)
sedimentary
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized coral with attached shell
Likely fossil coral (Scleractinia or Tabulata), with a bivalve or gastropod shell; exact identification requires microscopy
fossil
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Beaded blue-and-green gemstone jewelry
Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing
gemstone
Faceted gemstone in a jewelry setting
Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone
gemstone