Pumice
Pumice (Felsic volcanic rock)
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (a highly vesicular extrusive volcanic rock)
igneous
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
igneous
Porphyritic Basalt (or Porphyry)
Porphyritic Basalt (Mafic volcanic rock with phenocrysts)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sulfur (in host rock)
Native Sulfur (S8)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Vesicular Basalt (Scoria)
Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)
Igneous
Polished Basalt
Basalt (Mafic volcanic rock)
Igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Citrine (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Yellow Quartzite
Quartzite (primarily Silicon Dioxide - SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Golden Healer Quartz
Ferruginous Quartz (SiO2 with Fe2O3 inclusions)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentinite
Serpentinite (containing minerals of the Serpentine subgroup: Antigorite, Lizardite, and Chrysotile; formula (Mg,Fe)3Si2O5(OH)4)
metamorphic
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Granitic Pegmatite
Pegmatite
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)
metamorphic
Granite Glacial Erratic
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous