Quartz (Citrine or Iron-stained 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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Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
metamorphic
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Agate
Silicon Dioxide (SiO2)
sedimentary
Beach Pebble / Agate-bearing Chert Pebble
Microcrystalline Quartz (SiO2) with Inclusion Minerals
sedimentary
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Polished Black Basalt Pebble
Basalt
igneous
Pumice
Vesicular volcanic glass (primarily SiO2)
igneous
Tumbled Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Granite
Intrusive igneous rock (Acidic)
igneous
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Yellow Chert (Yellow Jasper)
Silicon dioxide (SiO2)
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Jasper pebble
Silicon Dioxide (SiO2 with iron oxide inclusions)
sedimentary
Blue Quartzite (Dyed)
Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)
metamorphic
Sandstone (Feldspathic / Arkose)
Sandstone (SiO2 with variable mineral grains)
sedimentary
Beach Pebble (Gabbro or Basalt Porphyry)
Mafic Igneous Rock (Porphyritic Basalt / Gabbro)
igneous
Hag Stone (Holey Rock / Fossiliferous Limestone)
Limestone (CaCO3) with natural erosion / fossil cavities
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pearl necklace
Pearl (biogenic calcium carbonate, chiefly aragonite; CaCO₃)
gemstone
Shale
Fissile Mudstone
sedimentary
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Moss-covered Limestone with Quartz/Calcite Pocket
Calcium Carbonate (CaCO3) rock with biological moss coating
sedimentary
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
sedimentary
Dyed Pumice
Vesicular Rhyolite (Artificial Coloration Addition)
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary