Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
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Sapphire
Corundum (Al2O3)
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
River Rock
Siliciclastic rock (water-worn pebble)
sedimentary
Basalt Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Dyed Agate
Agate (Silicon dioxide)
Mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Limonite
Hydrous ferric oxides (FeO(OH)·nH2O)
sedimentary
River Cobble (Quartzite / Porphyritic Igneous Rock)
Siliceous rock / Water-worn lithic fragment
igneous
Basalt Scoria
Aphanitic basaltic scoria
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Amethyst
Silicon dioxide (SiO2)
mineral
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Sandstone
Arenite
sedimentary
River Cobble (Quartzite)
Meta-orthoquartzite
metamorphic
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz Pebble / River Siltstone
Silicon Dioxide (SiO2) / Fine-grained Sedimentary Rock
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Concrete
Anthropogenic Conglomerate
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Quartzite Pebble (Stream-rounded Quartz/Quartzite Gravel)
Quartzite / Silicon Dioxide (SiO2)
metamorphic
Slate
Foliated metamorphic rock
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Bandit Heart Pebble (Quartz-Veined Sedimentary Rock)
Quartz-veined siltstone or sandstone
sedimentary
Shale / Mudstone
Sedimentary rock (Claystone / Mudstone / Shale)
sedimentary
Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Heat-Treated Amethyst (Citrine Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral