Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Category
Mineral (Man Made Composite)
Browse mineral (man made composite) specimens identified by the Rock Identifier community.
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Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)
Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)
igneous
Polished stromatolite (likely fossilized microbial mat)
Fossil stromatolite; chiefly microcrystalline quartz (SiO₂), commonly replacing carbonate
fossil
Basalt
Basalt
Igneous
Conglomerate
Polymictic Conglomerate
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Diamond
Native Carbon (C)
gemstone
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Diamond
Carbon (C)
gemstone
Fossilized echinoid (sea urchin), likely a flint/chalk-associated test
Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)
fossil
Orgonite Pyramid (containing Amethyst and mixed minerals)
Silicon Dioxide (SiO2) in synthetic resin
gemstone
Diamond (in Jewelry Setting)
Carbon (C)
gemstone
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Diamond
Carbon (C)
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Diamond
Diamond (pure carbon C)
mineral
Diamond
Carbon (C)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Diamond
Cubic carbon (C)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
sedimentary
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Granite
Granite (Phaneritic igneous rock)
igneous
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Likely iron-rich rock or weathered metallic mineral fragment
Uncertain; possibly limonite/goethite or iron-bearing slag
mineral
Granodiorite
Phaneritic Plutonic Intermediate-Felsic Rock
igneous
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Graphite
Graphite (Carbon, C)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Malachite
Malachite (Cu2CO3(OH)2)
mineral