Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Basalt
Aphanitic Mafic Volcanic Rock (Fe/Mg rich)
igneous
Weathered quartz-rich stone, possibly fossiliferous limestone
Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
sedimentary
Schist (Greenschist / Mica Schist)
Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)
metamorphic
Silver (Native Element)
Ag (Argentum)
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Blue Dyed Quartzite
Silicon Dioxide (SiO2) with artificial pigment
metamorphic
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Extrusive Igneous Basalt
igneous
Vesicular Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Pebble
Lithic fragment / Water-worn rock
sedimentary
Shale or Siltstone
Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)
sedimentary
Weathered vuggy quartz-rich rock (probable silicified limestone or quartz breccia)
Microcrystalline quartz (SiO₂) with calcite (CaCO₃), iron oxides, and minor clay minerals
sedimentary
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Peridotite (Dunite/Peridot Xenolith)
Peridotite (predominantly Olivine (Mg, Fe)2SiO4)
igneous
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
mineral
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Quartzite
SiO2 (Silicon Dioxide)
metamorphic
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary