Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Pink Thulite
Thulite (Ca2Al3(SiO4)3(OH)) - Pink Zoisite
Mineral
Quartz (specifically Milky/Gray Quartz vein)
Silicon Dioxide (SiO2)
mineral
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Sandstone
Sandstone (SiO2 with iron oxides and clay)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Jasper
Silicon Dioxide (SiO2)
mineral
Fossilized bivalve shell in limestone
Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Possible iron-rich concretion or weathered ironstone
Goethite/limonite-rich ironstone; exact identification requires testing
mineral
Ferruginous Sandstone (Gozzan)
Iron-rich clastic sedimentary rock with Limonite/Goethite
sedimentary
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Green Calcite (Onyx Marble)
Calcium Carbonate (CaCO3)
mineral
Iron Meteorite
Iron Meteorite (primarily Kamacite and Taenite, Fe-Ni alloys)
mineral
Ironstone Concretion
Ironstone (primarily Siderite or Limonite)
sedimentary
Milky quartz (rough quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz with iron-oxide staining
Quartz (SiO₂), likely ferruginous milky quartz
mineral
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Iron Meteorite
Siderite (Iron-Nickel Meteorite)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Tumbled blue chalcedony or pale aquamarine-like quartz
Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Micrometeorite (Spherule)
Extraterrestrial Accretion Spherule
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Tiger's Eye
Silicon Dioxide (Quartz with crocidolite inclusions), SiO2
gemstone
Sandstone
Clastic sedimentary rock
sedimentary
Polished hematite-rich ironstone
Hematite (Fe₂O₃), likely mixed with magnetite and iron-rich jasper
mineral
Polished/tumbled multicolored stone, possibly jasper
Likely opaque microcrystalline quartz (chalcedony/jasper); exact identification is uncertain because the image is out of focus
mineral
Tumbled green aventurine (likely)
Quartz, SiO₂, containing green fuchsite mica or other inclusions
mineral
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Biotite-bearing granite or gneiss
Felsic granitoid; chiefly quartz, feldspar, and biotite mica
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Fossil Shark Tooth
Selachii fossil
fossil
Mammoth Tooth
Mammuthus tooth
fossil
Fossilized Horse Tooth
Equus sp. (Tooth)
fossil
Massive Quartz
Silicon dioxide (SiO2)
mineral
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)