Basalt
Basalt (Mafic igneous rock)
igneous
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
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Asphalt Concrete
Bituminous conglomerate
sedimentary
Garnet Schist
Almandine-Garnet Schist
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)
metamorphic
Chert (Red Jasper variant)
Silicon dioxide (SiO2)
sedimentary
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sulfur-bearing Limestone (Solfatara Specimen)
Sulfur-rich Bio-limestone (Calcium Carbonate with Native Sulfur, S8)
sedimentary
Olivine Peridotite
Peridotite (comprising Olivine (Mg,Fe)2SiO4 and Pyroxene)
igneous
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Mica Schist
Mica Schist (contains Muscovite KAl2(AlSi3O10)(OH)2)
metamorphic
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) containing Iron Oxide inclusions
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Schist
Mica Schist
metamorphic
Quartzite River Stone
Quartzite (primarily SiO2)
metamorphic
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Garnet
Almandine/Pyrope Garnet (Silicate Mineral Group)
mineral
Mica Schist
Schist (muscovite-quartz dominant)
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Schist (Mica Schist)
Mica Schist
metamorphic
Schist
Schist (variety likely Mica Schist)
metamorphic
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
White Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Porphyritic Basalt
Basalt (Extrusive Igneous Rock)
igneous
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Vesicular volcanic glass)
igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary