Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Category
Man Made Composite
Browse man made composite specimens identified by the Rock Identifier community.
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Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Granite
Granite (a plutonic igneous rock)
Igneous
Sandstone
Arenite
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Diamond
Diamond (pure carbon C)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Basalt
Basalt
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)
Sedimentary Rock
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Diamond
Carbon (C)
mineral
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral