Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
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Heat-Treated Amethyst (Citrine Geode)
Silicon Dioxide (SiO2) with iron impurities
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Chert or flint
Microcrystalline quartz (SiO₂), likely chalcedony-rich chert
sedimentary
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
sedimentary
Yellow Ochre (Limonite)
Limonite (FeO(OH)qnH2O)
sedimentary
Glacially transported granite and gneiss boulders
Granite (quartz–feldspar–mica); banded specimens likely gneiss
igneous and metamorphic
Jasper
Jasper (SiO2 plus impurities)
sedimentary
Pumice
Pumice (a vesicular volcanic glass)
igneous
Granite (likely Kashmir/ivory-type granite)
Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole
igneous
Conglomerate
Clastic sedimentary rock (Polymict conglomerate with quartz/calcite matrix)
sedimentary
Tumbled honey-colored chalcedony or quartzite
Microcrystalline quartz, SiO₂; exact identification requires testing
mineral
Polished brecciated jasper (likely ribbon jasper)
Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide inclusions
mineral
Blue Quartzite (Dyed)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Green Chalcedony (likely Chrysoprase or dyed Green Agate)
Silicon Dioxide (SiO2) with nickel impurities or chromium/dye
mineral
Diamond
Native Carbon (C)
mineral
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)
mineral
Red jasper (tumbled river pebble)
Jasper, an opaque microcrystalline variety of quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Limonite (Iron Ore)
Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Tumbled Mixed Gemstones (Quartz and Rutile)
Silicon Dioxide (SiO2) with various inclusions
mineral
Granite Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Limonite with Ironstone
Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Diamond
C (Native Carbon)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2)
mineral
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Blue Sapphire (Raw/Tumbled Corundum)
Corundum (Aluminum Oxide, Al2O3 with Fe/Ti traces)
mineral
Veined Quartzite Pebble (Heart-Shaped)
Metamorphosed quartz-rich sandstone with quartz veins
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
sedimentary
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Ironstone / limonite-rich concretion
Hydrated iron oxides, chiefly limonite/goethite (FeO(OH)·nH₂O), possibly with hematite
mineral
Iron-rich botryoidal limonite/goethite specimen
Limonite (amorphous hydrated iron oxides, chiefly goethite, α-FeO(OH))
mineral
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral