Opalite
Synthetic glass / Opalized glass
gemstone
Category
Man Made Composite (Lithified Equivalent Of Sedimentary)
Browse man made composite (lithified equivalent of sedimentary) specimens identified by the Rock Identifier community.
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Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Rounded gray-brown cobble, likely weathered sandstone or quartzite
Tentatively quartz-rich sandstone (SiO₂-dominated); exact identification requires hardness and acid tests
sedimentary
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)
Unidentifiable Rock Fragment
Uncertain
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Weathered conglomeratic river cobble
Polymictic conglomerate or breccia, likely matrix-supported
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Asphalt Concrete
Bituminous conglomerate
sedimentary
Cullet Glass / Slag Glass
Amorphous silica glass
man-made glass / industrial byproduct
One Pound Coin (UK)
Nickel-Brass Alloy (Cu-Zn-Ni)
mineral
Concrete
Anthropogenic Conglomerate
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Green Sea Glass
Man-made silicate glass (weathered)
sedimentary
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Opalite
Synthetic glass / Opalized glass
gemstone
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Chert (Chalky Flint Node)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Not a geological specimen
N/A (man-made object)
N/A
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
Opalite
Synthetic Glass (Simulated Opal)
gemstone
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Gabbro
Gabbro (Mg, Fe)2Si2O6 / (Ca, Na)(Al, Si)4O8
igneous
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous