Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Not A Natural Rock
Browse not a natural rock specimens identified by the Rock Identifier community.
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Hag Stone (Banded Chert or Limestone with Borehole)
Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)
sedimentary
Kimberlite
Kimberlite (Potassic ultramafic igneous rock)
igneous
Sandstone
Arenite
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Not a rock
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Purple Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Not a rock
Not a rock
Not a rock
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
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
mineral
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
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
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Quartz (specifically Citrine or Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (composed mainly of SiO2)
sedimentary
Smoky Quartz on Feldspar (Granite Pegmatite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
igneous
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Amethyst (Tumbled)
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary