Aura Quartz Geode (Angel Aura Quartz)
Silicon Dioxide (SiO2) bonded with precious metals
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Celestine Geode
Strontium Sulfate (SrSO4)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Iridescent polished/tumbled stone (likely coated quartz or glassy synthetic material)
Indeterminate; possibly quartz (SiO₂) with an artificial iridescent coating
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite/Goethite Concretion
Goethite (FeO(OH))
sedimentary
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (River Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Peacock ore (likely chalcopyrite-bornite specimens)
Iridescent chalcopyrite, CuFeS₂, commonly altered to bornite, Cu₅FeS₄
mineral
Dyed blue banded agate (tumbled)
Microcrystalline quartz, SiO₂ (chalcedony variety)
gemstone
Tumbled chalcedony (likely carnelian or common agate)
Microcrystalline quartz, SiO₂; chalcedony variety
mineral
Blue chalcedony (likely dyed or coated)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Botryoidal Hematite
Iron Oxide, Fe2O3
mineral
Tumbled blue stone, likely blue aventurine or dyed chalcedony
Aventurine quartz (SiO₂) or chalcedony (microcrystalline SiO₂); exact identification requires testing
mineral
Tumbled blue chalcedony (likely blue quartz)
Chalcedony, cryptocrystalline SiO₂; possibly chrysoprase or dyed quartz
mineral
Tumbled smoky quartz (probable)
Quartz, SiO₂; smoky variety colored by irradiation-related defects
mineral
Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Heat-Treated Citrine (Amethyst-based)
Quartz (Silicon Dioxide) - SiO2
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Banded Flint
Silicon Dioxide (Cryptocrystalline Quartz)
sedimentary
Chert
Silicon Dioxide (SiO2)
sedimentary
Flint
Cryptocrystalline quartz (SiO2)
sedimentary