Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Textile (Upholstery Fabric)
Woven Polyethylene/Polyester or Cotton Blend
Synthetic or Natural Fiber
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Sandstone (Calcareous or Ferruginous)
Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Quartz Druzy on Agate (River Cobble)
Silicon Dioxide (SiO2)
Mineral / Sedimentary (often associated with volcanic hosts)
Sandstone
Arenite (primarily SiO2)
sedimentary
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Purple Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Blue Tiger's Eye
Riebeckite (crocidolite variety)
Mineral
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary