Sandstone
Arenite
Sedimentary
Category
Antropogenic (Man Made Glass Byproduct)
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
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Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Basalt
Basalt
igneous
Peridot (likely, based on color and appearance)
Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)
Mineral
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Basalt
Basalt (Mafic volcanic rock)
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Diamond
Carbon (C)
mineral
Yellow tumbled/rough chalcedony, possibly citrine or dyed agate
Chalcedony (microcrystalline SiO₂), with yellow coloration likely from iron oxides; exact identification is uncertain from the photograph
mineral
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Obsidian (Apache Tear)
Obsidian / Amorphous Volcanic Glass (main component: SiO2)
igneous
Sandstone
Arenite (SiO2 composition primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Diamond
Carbon (C)
gemstone
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Pearl
Aragonite (CaCO3 with conchiolin)
mineral
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Likely serpentine (serpentinite) pebbles
Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly Mg₃Si₂O₅(OH)₄, sometimes containing magnetite, chromite, and minor carbonate minerals
metamorphic
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Raw calcite specimen
Calcite, calcium carbonate (CaCO₃)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Vesicular volcanic rock, likely pumice or scoria
Pumice/scoria; predominantly volcanic glass with plagioclase, pyroxene, and/or olivine
igneous
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Diamond
Carbon (C)
gemstone