Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
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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Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Chiastolite (Andalusite)
Al2SiO5
metamorphic
Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Conglomerate (Red Sandstone variety)
Clastic Sedimentary Rock (Conglomeratic Sandstone)
sedimentary
Granite Pebble
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Yellow-brown quartz/chalcedony fragment
Quartz, SiO₂; likely microcrystalline chalcedony with iron-oxide staining
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Sandstone (Red)
Arenite (Fe2O3 heavy)
sedimentary
Porphyritic rhyolite (likely lithophysal/vesicular rhyolite)
Rhyolite; chiefly quartz and alkali feldspar, with minor plagioclase and iron-bearing minerals
igneous
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Chert (Flint nodule)
Silicon dioxide (SiO2)
sedimentary
Pumice
Pumice (Volcanic Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite
sedimentary
Banded Sandstone (River Pebble)
Clastic Sedimentary Rock (SiO2 with impurities)
sedimentary
Basalt (River Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Sandstone (Red / Iron-stained)
Sandstone (composed predominantly of SiO2 with Fe2O3 cement)
sedimentary
Hardened Gray Mudstone
Argillite / Silicified Mudstone (principally SiO2 and Al2Si2O5(OH)4)
sedimentary
Milky Quartz Vein in Mafic Rock
Quartzite vein in Metabasalt (SiO2 base)
metamorphic
Quartzite
Quartzite (composed primarily of silica, SiO2)
metamorphic
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Chert (and Agate/Quartz in Geode-like Nodule)
Silicon Dioxide (SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz (SiO₂), commonly with chalcedony and iron-rich alteration minerals
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Ferruginous Sandstone
sedimentary
Pumice
Pumice (Highly vesicular felsic volcanic rock)
igneous
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Pumice
Pumice (Alveolar Rhyolite / Dacite / Andesite)
igneous
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
mineral