Blue Anhydrite
Anhydrite (CaSO4)
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Jasper-like)
Silicon dioxide (SiO2)
sedimentary
Blue Sapphire (Ceylon)
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Coquina Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Basalt with Peridotite Inclusion
Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Slate
Slate (Metamorphic Rock)
metamorphic
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Sandstone
Sedimentary Arenite
sedimentary
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Smoky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Sandstone Concretion
Clastic Sedimentary Rock - Quartz Arenite / Sandstone
sedimentary
Sandstone
Arenite
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a concretionary structure
sedimentary
Anthracite Coal
Anthracite
metamorphic
Diamond (Set in jewelry)
Cubic Carbon (C)
mineral
Chert (variant Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tufa
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Chert (or Fossiliferous Limestone)
Microcrystalline Quartz (SiO2) / Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Chert (variations like Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Ferromanganese Nodule
Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)
sedimentary
White Chalcedony (likely Common Opal or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2) in a Sedimentary Host
mineral
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Grey River Pebble (Greywacke / Basalt)
Stream-rounded silicate rock pebble
sedimentary
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary