Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
Category
Browse mineral composite specimens identified by the Rock Identifier community.
Terrazzo (Man-made Composite)
Cementitious or Resin-bound Lithic Composite
Turquoise cabochon
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing
Pearl
Nacre (aragonite, CaCO₃, with conchiolin)
Wood Paneling
Engineered Wood / Plywood Paneling
Decorative orb of likely sodalite-bearing rock or dyed stone
Most consistent with sodalite-rich nepheline syenite or a blue-and-white composite; exact identification requires testing
Agate (Dyed) or composite stone
SiO2
Turquoise cabochon jewelry
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
Fossil crocodilian skull and jaws
Crocodyliform fossil; exact genus and species cannot be determined from the image
Graphite
Graphite (elemental carbon, C)
Malachite cabochon or polished bead
Malachite, Cu₂CO₃(OH)₂
Moon (lunar surface depiction)
Lunar rock; chiefly anorthosite, basalt, and breccia (plagioclase-rich CaAl2Si2O8)
Unakite
Unakite Epidosite (composite of Epidote, Orthoclase, and Quartz)
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
Turquoise (likely stabilized or composite)
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
Polished turquoise (likely stabilized)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
Cultured pearls
Pearl; predominantly aragonite (CaCO₃) in nacre with organic conchiolin
Ruby in Fuchsite (Composite/Stabilized)
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Polished/tumbled stone, likely serpentine or agate
Probable serpentine-group mineral (antigorite/lizardite), possibly a green jasper or agate; image is insufficient for certainty
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper silicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with quartz or turquoise
Polished turquoise-bearing rock
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a brown host rock or matrix
Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
Unakite
Altered granite (Epidote, Orthoclase Feldspar, and Quartz)
Unakite
Epidotized Granite
Polished serpentine-rich stone (likely serpentine jasper or “rainforest jasper”)
Serpentine-group minerals, chiefly antigorite/lizardite, with iron oxides and silica-rich rock matrix
Polished tiger iron
Tiger iron; interlayered hematite, jasper, and crocidolite-quartz (often riebeckite)
Likely graphite-rich schist or graphite-bearing metamorphic rock
Graphite (C) in a mica/quartz-rich matrix; exact rock name requires testing
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
Ruby ring
Corundum (Al₂O₃), red variety colored mainly by chromium
Red cabochon gemstone, likely carnelian or red agate
Cryptocrystalline quartz (chalcedony), SiO₂
Turquoise ring stone (likely stabilized or dyed turquoise)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
Polished pietersite-like brecciated jasper
Silicified chalcedony/jasper aggregate, primarily SiO₂; exact material uncertain from image
Polished black stone, likely black tourmaline or black obsidian
Most consistent with schorl tourmaline (NaFe3Al6(BO3)3Si6O18(OH)4), though black obsidian (volcanic glass) is also possible
Tumbled quartz-rich stone, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if metamorphic
Unakite
Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)
Fossilized Shell Fragment / Mother of Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral
Dalmatian jasper
Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar
Fossilized turtle shell or carapace
Testudines indeterminate; shell mainly fossilized calcium-carbonate bone (apatite)
Blue turquoise cabochon
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely dyed or stabilized, flower-shaped polished piece
Fossilized coral with attached shell
Likely fossil coral (Scleractinia or Tabulata), with a bivalve or gastropod shell; exact identification requires microscopy
Unakite
Epidotized Granite