Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Category
Man Made Material (Anthropogenic 'Mineraloid')
Browse man made material (anthropogenic 'mineraloid') specimens identified by the Rock Identifier community.
Learn about Man Made Material (Anthropogenic 'Mineraloid') in the encyclopedia
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Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Titanium Amethyst Geode
Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer
mineral
Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Blue Goldstone
Man-made glass with suspended copper, cobalt, or manganese particles
man-made glass
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Obsidian
Obsidian (volcanic glass)
Igneous
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Dyed Blue Agate (Dragon Vein Agate)
Silicon Dioxide (SiO2) with artificial cobalt/organic dyes
mineral
Diamond
Native Carbon (C)
mineral
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Green Agate
Silicon dioxide (SiO₂)
mineral
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
mineral
Raw quartz crystal
Quartz (silicon dioxide, SiO₂), likely milky or included quartz
mineral
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass