Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Category
Synthetic (Man Made Material Mimicking Natural Stone)
Browse synthetic (man made material mimicking natural stone) specimens identified by the Rock Identifier community.
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Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Dalmatian Stone
Dalmatian Stone (Felsic Igneous Rock)
igneous
Emerald
Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium
mineral
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Amber-set ring
Amber (fossilized plant resin; organic mineraloid), set in a metal ring
gemstone
Amethyst ring
Amethyst, purple quartz (SiO₂)
gemstone
Diamond (Baguette cut)
Carbon (C)
gemstone
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Yellow faceted gemstone, likely citrine or yellow beryl
Quartz (SiO₂), if citrine; beryl (Be₃Al₂Si₆O₁₈), if heliodor
gemstone
Diamond
Carbon (C)
gemstone
Botryoidal hematite (specular hematite)
Hematite, Fe₂O₃
mineral
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Polished purple gemstone, likely amethyst
Amethyst: purple quartz, silicon dioxide (SiO₂)
gemstone
Tektite
Natural impact glass
meteorite
Likely gold-colored metal ring with a possible gemstone
Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting
mineral
Diamond
Diamond (C)
mineral
Diamond
Carbon (C), Native Element
mineral
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Orange glassy slag (industrial by-product)
Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Red faceted gemstone ring
Likely synthetic ruby or red spinel; exact identification requires testing
gemstone
Red coral (likely precious coral)
Corallium sp.; calcium-carbonate skeleton, primarily calcite
gemstone
Ruby (Raw Corundum)
Al2O3 (Aluminum Oxide)
mineral
Blue topaz pendant
Topaz (Al₂SiO₄(F,OH)₂), likely treated blue topaz
gemstone
Tumbled chalcedony (likely milky quartz)
Microcrystalline quartz, SiO₂; possibly pale agate or quartzite
mineral
Chalk
Calcite (CaCO3)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Diamond or Cubic Zirconia
Carbon (diamond) or Zirconium dioxide (cubic zirconia)
gemstone
Sandstone
Arenite
sedimentary
Inlaid stone ring (likely jasper or agate)
Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays
gemstone
Turquoise ring
Turquoise, hydrated copper–aluminum phosphate (CuAl₆(PO₄)₄(OH)₈·4H₂O)
gemstone
Vesicular basalt (likely scoria)
Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix
igneous
Blue cabochon gemstone ring
Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel
gemstone
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Chalk
Calcium carbonate (CaCO3)
sedimentary
Polished dendritic agate or jasper
Microcrystalline quartz (SiO₂), likely chalcedony with iron/manganese dendrites
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Dalmatian jasper
Orbicular rhyolite, commonly sold as Dalmatian jasper; quartz- and feldspar-rich volcanic rock with dark amphibole/biotite inclusions
igneous