Porcelain (White Ceramic)
Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)
metamorphic
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Unidentifiable Rock Fragment
Uncertain
Opalite
Synthetic glass / Opalized glass
gemstone
Turquoise ring (likely stabilized or imitation turquoise)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; exact material is uncertain from the image
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Green-and-white terrazzo (likely serpentine/marble aggregate)
Composite decorative stone; probable serpentinite (Mg₃Si₂O₅(OH)₄) with white calcite marble fragments in cementitious matrix
metamorphic
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Asphalt Chunk
Asphalt concrete
man-made composite
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Blue cabochon gemstone, likely synthetic glass or dyed stone
Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli
gemstone
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Opalite
Synthetic glass / Opalized glass
gemstone
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Tumbled milky quartz
Quartz (SiO₂), cryptocrystalline-to-massive variety
mineral
Polished blue glassy mineral specimen, likely sodalite or blue aventurine
Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Green Aventurine
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Not a geological specimen
N/A (man-made object)
N/A
Tumbled milky quartz
Quartz — silicon dioxide (SiO₂), cryptocrystalline or microcrystalline variety possible
mineral
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
White pebble, likely quartz or calcite
Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)
mineral
Likely clear quartz pebble or glassy quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Opalite
Synthetic glass (SiO2 + impurities)
mineral
Diamond
Native Carbon (C)
gemstone
Dyed Agate
Chalcedony (SiO2)
mineral
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
metamorphic
Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)
Silicon Dioxide (SiO2) with inclusions/dye
gemstone
Engineered Quartz (Quartzite look-alike)
Silicon Dioxide (SiO2) composite
mineral-based composite
Clear quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Not a rock, mineral, or geological specimen
N/A