Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
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Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Tumbled black obsidian (likely)
Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)
igneous
Blue glassy fragment among beach gravel
Likely cobalt-blue man-made glass; not a natural mineral specimen
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Tektite
Natural impact glass
meteorite
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Black-and-white agate geode pendant
Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz
mineral
Green sea glass (likely bottle glass)
Human-processed soda–lime silicate glass; not a natural mineral or rock
mineral
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Flint
Silicon dioxide (SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Botryoidal chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony
mineral
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Granite
Granite (a plutonic rock)
Igneous
Rounded pink granite cobble
Granite, chiefly quartz–alkali feldspar–plagioclase–biotite
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Rounded quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Sandstone
Arenite
sedimentary
Red cabochon gemstone ring (likely glass or synthetic stone)
Undetermined; the image does not establish a natural mineral identity
gemstone
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (likely flint)
Microcrystalline quartz, SiO₂
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Likely smoky quartz pendant
Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects
gemstone
Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate
Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain
gemstone
Pale green aventurine (likely quartz) sphere
Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment
mineral
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sandstone
Arenite
sedimentary
Chert (varietal Flint)
Microcrystalline quartz (SiO2)
sedimentary
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Polished brecciated jasper pendant
Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation
mineral
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with synthetic dye
mineral
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Turquoise cabochon ring
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone