Weathered iron-rich rock, likely laterite or ironstone
Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals
sedimentary
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Black Sapphire
Corundum (Al2O3)
mineral
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Diamond
Carbon (C)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Tektite (Indochinite)
Tektite (High-silica impact glass)
igneous
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Yellow Jasper
Quartz (Silicon Dioxide, SiO2 with impurities)
sedimentary
Chert (Quartz var.)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chiastolite
Andalusite variety Chiastolite
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Crinoid Stem Fossil
Crinoida (columnal ossicles)
fossil
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Granite
Granite
Igneous
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor lazurite/pyrite or calcite inclusions
mineral
Rough Diamond
Diamond (Native Carbon, C)
mineral
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Petrified Wood
Silicified wood (Quartz replacement, SiO2)
fossil
Diamond
C (Native Carbon)
gemstone
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled blue-dyed stone, likely basalt or blue aventurine
Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing
igneous
Diamond
C (Native Carbon)
gemstone
Beryl (Variety Mix)
Be3Al2(Si6O18)
Mineral
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Cubic Zirconia (or possibly Diamond)
Zirconium dioxide (or Carbon)
gemstone
Tektite (likely indochinite)
Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium
mineral
Weathered porphyritic basalt
Basalt, likely plagioclase-phyric basalt; primarily a fine-grained aggregate of plagioclase feldspar, clinopyroxene, and possibly olivine or iron-titanium oxides
igneous
Diamond (or diamond simulant)
C
gemstone