Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Gold Nugget
Native Gold (Au)
mineral
Gold Ore / Native Gold
Native Gold (Au)
mineral
Gold
Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Mineral
Amethyst Quartz (Amethyst Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O
mineral
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Banded Calcite (often sold as Onyx or Mexican Onyx)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Conglomerate
Polymictic Conglomerate
sedimentary
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Scoria (Vesicular Basalt)
Vesicular Basalt
igneous
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
sedimentary (base), then artificial
Sandstone
Arenite (SiO2 based with quartz, feldspar, or lithic fragments)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Native Copper
Native Copper (Cu)
mineral
Bloodstone (also known as Heliotrope)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Gold Nugget
Native Gold (Au)
mineral
Diamond
Native Carbon (C)
mineral
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Dragon Stone
Ohko Stone (Argillaceous sedimentary rock)
sedimentary
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Quartzite
Quartzite (SiO2)
metamorphic
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Zebra Jasper (Zebra Stone)
Tumbled Silicon Dioxide (SiO2) with impurities
sedimentary
Bumblebee Jasper
Hydrothermal Volcanic Rock (Primarily Calcite with Orpiment - As2S3, Realgar, and Pyrite)
igneous
Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Iron Meteorite
Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)
Mineral