Fossil shark tooth, likely sand tiger shark
Fossilized selachian tooth; possibly *Carcharias* or *Striatolamia*
fossil
Category
Mineral
Browse mineral specimens identified by the Rock Identifier community.
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Shark Tooth Fossil
Carcharodon / Otodus fossilized tooth (Calcium Phosphate / Hydroxyapatite)
fossil
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz with Calcite
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Limonite (Ironstone) pseudomorph
Limonite (Hydrous ferric oxide), FeO(OH)·nH2O
mineral
Pegmatitic granite (quartz–feldspar rock)
Granitic pegmatite, composed chiefly of quartz (SiO₂) and feldspar, with possible mica
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Black Sand (Magnetite Sand)
Magnetite (Fe3O4)
mineral
Likely mica schist
Mica-rich schist, likely muscovite–biotite schist; exact identification requires examination
metamorphic
Weathered granite pebble
Granite, composed mainly of quartz, feldspar, and mica
igneous
Pink granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Weathered granite or granitic gneiss
Quartz–feldspar–mica granitic rock; possible biotite gneiss
igneous
Quartz-rich Diorite
Diorite (Phaneritic intermediate igneous rock)
igneous
Gneiss
Gneiss
metamorphic
Granodiorite
Granodiorite
igneous
Granite fragment
Granite (Felsic intrusive igneous rock)
igneous
Gneiss (High-grade Metamorphic Rock)
Gneiss
metamorphic
Granite Cobble
Granite
igneous
Granite
Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)
igneous
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Banded Gneiss
Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Native Copper in Basalt
Cuprum (with Host Basalt)
igneous
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Limonite
FeO(OH)·nH2O
mineral
Vesicular basalt (likely iron-rich volcanic rock)
Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine, with iron oxides
igneous
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Granite fragment
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Likely granite
Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and mica
igneous
Likely granite pebble
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Rounded granitic pebble
Granite, composed mainly of quartz, feldspar, and dark mica or amphibole
igneous
Granite
Intrusive Igneous Rock
igneous