Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Anthropogenic Specimen (Man Made Material)
Browse anthropogenic specimen (man made material) specimens identified by the Rock Identifier community.
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Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Coquina
Bioclastic Limestone
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
mineral
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Sandstone
Arenite
sedimentary
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)
Igneous
Botryoidal chalcedony (likely white quartz/chalcedony)
Microcrystalline quartz, SiO₂; possibly partly altered carbonate or opaline silica
mineral
Banded Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Quartz
Silicon dioxide (SiO₂)
Mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Likely weathered iron-rich rock or slag fragment
Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)
mineral
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Black Chert River Stone
Cryptocrystalline Quartz (SiO2)
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Polished white chalcedony or milky quartz pebble
Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion
mineral