Asphalt aggregate
Human-made bituminous asphalt containing crushed silicate rock aggregate
sedimentary
Category
Not A Natural Rock
Browse not a natural rock specimens identified by the Rock Identifier community.
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Light-colored rounded pebble (possibly quartzite)
Unidentified siliceous rock; quartzite is a plausible but unconfirmed identification
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Amethyst
Silicon dioxide (SiO2)
mineral
Fossil-bearing rock, possibly a small fossil shell or coral fragment in limestone
Indeterminate carbonate matrix; likely calcite-rich limestone containing a fossil fragment
fossil
Sandstone
Arenite
sedimentary
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Turquoise (Dyed Howlite/Magnesite)
CuAl6(PO4)4(OH)8·4H2O (Natural Turquoise) or Ca2B5SiO9(OH)5 (Howlite)
mineral
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Lithic Wacke)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Agate with Fossil/Inclusion
Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion
sedimentary
Sandstone
Arenite (SiO2 with minor iron oxides)
sedimentary
Opalite-style pendant (likely synthetic glass, not natural opal)
Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)
gemstone
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Veined Quartzite or Sandstone
Quartzite with Quartz Veins (SiO2)
sedimentary
Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Coquina or Fossiliferous Conglomerate
Bioclastic Rudstone (variable composition)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Unidentifiable embedded dark fragment
Indeterminate; possibly a dark silicate mineral or lithic inclusion
mineral
Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary
Granite Pebble (Pink Feldspar-rich)
Granite
igneous
Amethyst Geode
Silicon Dioxide (Quartz), SiO2
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Orange Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Cluster
Silicon Dioxide (Quartz), SiO2
mineral
Heat-Treated Amethyst (Citrine Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded river pebble, likely gneiss
Foliated quartz–feldspar rock, possibly banded gneiss
metamorphic
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Sea glass (likely green bottle glass)
Human-made soda-lime silicate glass; not a natural mineral or geological rock
mineral