Hag Stone (Holed Quartzite Pebble)
Quartzite (SiO2 based) with natural vug or erosion hole
sedimentary/metamorphic
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Bumblebee Jasper
Fibrous Calcite and Orpiment/Realgar/Pyrite mix
gemstone
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Scoria (Vesicular Basalt)
Vesicular Basalt
igneous
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Metallic iron meteorite (probable)
Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)
meteorite
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Granite
Phaneritic Granitoid
igneous
Probable galena
Galena (lead sulfide, PbS)
mineral
Likely galena-bearing ore
Galena (PbS), possibly mixed with quartz or carbonate gangue
mineral
Diorite
Intermediate Phaneritic Igneous Rock
igneous
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pebble
Clast (Lithic fragment / Quartzite pebble)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomeratic Sandstone
sedimentary
Favosite Fossil (Calyx or Rugose Coral)
Favosites (Extinct Tabulate Coral)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartzite (River Cobble)
Quartzite (mostly SiO2)
metamorphic
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Metallic sulfide ore, likely galena-bearing rock
Galena (lead sulfide, PbS), possibly with pyrite or other sulfides
mineral
Raw galena specimen
Galena (lead sulfide, PbS)
mineral
Polished orbicular granite (likely larvikite or orbicular diorite)
Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing
igneous
Firewood (Wood Log)
Lignum (Plant tissue composed of cellulose and lignin)
Organic (Non-geological)
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Fossilized Turritella Gastropod (Internal Mold)
Turritella (Fossil Gastropod Crust)
sedimentary
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Silver (Native Silver/Alloy Specimen)
Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy
mineral
Blue opalite (often sold as synthetic opal)
Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)
gemstone
Clear quartz sphere or polished quartz cabochon (tentative)
Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone
gemstone
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Quartzite
Quartzite (SiO2)
metamorphic