Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Category
Man Made Alloy (Metallic)
Browse man made alloy (metallic) specimens identified by the Rock Identifier community.
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Iron Meteorite
Iron-Nickel Alloy (Kamacite and Taenite)
mineral
Native copper (probable copper-rich mineral specimen)
Copper, Cu; possibly mixed with cuprite, malachite, and iron-oxide alteration minerals
mineral
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Native Copper
Copper (Cu)
mineral
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Native copper-bearing rock (probable copper ore)
Native copper (Cu), likely with copper sulfide/oxide minerals in a host rock
mineral
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)
Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock
mineral
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Copper Ore
Native Copper (Cu) often found with Chalcocite (Cu2S) or Bornite (Cu5FeS4)
mineral
Bismuth
Native Bismuth (Bi)
mineral
Arsenopyrite in Sulphide Ore
Arsenopyrite (FeAsS)
mineral
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Sea Glass (White/Clear)
Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO
Anthropogenic (Man-made product subject to geological processes)
Metallic iron meteorite (probable)
Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)
meteorite
Iron meteorite fragment
Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment
meteorite
Iron Meteorite
Siderite (Fe-Ni alloy, primarily Kamacite and Taenite)
igneous
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Bismuth
Bismuth (element Bi) with oxidized thin-film interference layer
mineral
Silicon
Crystalline Silicon (Si)
mineral
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Gold Nugget
Native Gold (Au)
mineral
Native Copper
Copper (Cu)
mineral
Gold Nugget
Native Gold (Au)
mineral
Cullet Glass (sometimes mistaken for Blue Obsidian or Slag)
Amorphous Silicon Dioxide (SiO2) with chemical additives (e.g., Cobalt for blue color)
mineraloid / industrial byproduct
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Iron Meteorite (Campo del Cielo)
Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)
igneous
Iron Meteorite
Siderite (comprised primarily of Kamacite and Taenite alloys)
igneous
Silver (S925)
Native Silver (Ag)
mineral
Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Metamorphic (modified)
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Diamond
Native Carbon (C)
mineral
Copper Nugget
Native Copper (Cu)
mineral