Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Not A Natural Rock
Browse not a natural rock specimens identified by the Rock Identifier community.
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Asphalt Concrete
Bituminous conglomerate
sedimentary
Granite
Phaneritic Felsic Igneous Rock (composed of quartz, feldspar, and mica)
igneous
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Coquina
Biogenic Limestone (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Picture Jasper
Silicon dioxide (SiO2)
sedimentary
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Agate Geode
Microcrystalline Quartz (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Hag Stone
Perforated Chert (Microcrystalline Silica, SiO2)
sedimentary
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)