Milky Quartz Nodule / Geode precursor
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
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Agate
Chalcedony (SiO2)
mineral
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
River Pebble (Quartzite/Chert)
Quartzite with inclusions (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Porphyritic Andesite
Andesite (Intermediate Volcanic Rock)
igneous
Possible iron-rich chert or slag-like rock
Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Red Quartz (Druzy)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) vein cutting through host rock
mineral
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Granodiorite
Granodiorite
igneous
Basalt
Basalt
igneous
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Slate
Foliated Metamorphic Rock
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Quartz (Gravel Fragment)
Silicon Dioxide (SiO2)
mineral
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
igneous
Basalt (Weathered)
Mafic Igneous Rock
igneous
Sandstone (lithic/quartz variant)
Clastic sedimentary rock (SiO2 predominant)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Peridotite (Olivine/Peridot)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Lava Rock (Basaltic Scoria)
Vesicular Basalt
igneous
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Bituminous Coal
Coal (Sedimentary Rock)
sedimentary
Weathered iron-rich rock, likely limonite/goethite-bearing laterite
Limonite–goethite aggregate, commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)
mineral
Granodiorite
Granodiorite
igneous
Diamond (in Matrix)
Carbon (C)
mineral
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Possible basaltic rock or meteorite candidate
Likely vesicular basalt; meteorite identification cannot be confirmed visually
igneous
Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Quartzite
Quartzite (SiO2)
metamorphic