Scoria (Lava Rock)
Scoria (Extrusive Igneous Rock / Mafic Silicates)
igneous
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
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Weathered brown quartz-rich rock, likely sandstone
Quartz-rich sandstone (indeterminate lithology)
sedimentary
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Diamond
Native Carbon (C)
gemstone
Conglomerate (pebble-to-cobble gravel)
Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix
sedimentary
Serpentinite pebble
Serpentinite, composed chiefly of serpentine-group minerals (lizardite, chrysotile, antigorite), with possible magnetite and chlorite
metamorphic
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone
Iron oxides/hydroxides, chiefly limonite/goethite (FeO(OH)·nH₂O), with a probable silicate or clay matrix
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Weathered iron-rich rock, possibly laterite or altered basalt
Probable ferruginous basalt/lat eritic material; exact identification requires testing
igneous
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Moissanite
Silicon Carbide (SiC)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert Nodules (with Flint core)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian with Slate/Tuff
Volcanic glass (SiO2) with associated pyroclastic rock
igneous
Ruby in Matrix
Corundum (Al2O3)
mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone (lithic wake or graywacke)
Clastic sedimentary rock (primarily quartz and lithic fragments)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Chert (specifically Yellow/Common Opal or Jasper mixture)
Silicon Dioxide (SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Rock consisting chiefly of Quartz (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (lithic/arkosic)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Tumbled black stone, likely basalt or black jasper
Probably basalt (fine-grained plagioclase–pyroxene rock); exact identification is uncertain from the image
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary