Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Man Made Composite)
Browse sedimentary (man made composite) specimens identified by the Rock Identifier community.
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Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)
Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)
igneous
Freshwater Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic composite
gemstone
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Coquina / Fossiliferous Limestone
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Polished basalt or basaltic river pebble
Basalt; fine-grained plagioclase–pyroxene rock, possibly containing olivine
igneous
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
fossil
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
White pebbles (rock material not identifiable from the image)
Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock
sedimentary
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Sandstone (Pebble)
Arenite
sedimentary
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Brecciated Jasper
Brecciated Jasper (Microcrystalline Quartz / SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Honey Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Chert (or Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline quartz (SiO2)
sedimentary
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Sandstone
Arenite
sedimentary
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper silicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with quartz or turquoise
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary