Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Gneiss
Gneiss
metamorphic
Granite
Intrusive igneous felsic rock
igneous
Chert (Jasper/Mudstone variety with Oxidation)
Silicon dioxide (SiO2)
sedimentary
Opalite
Synthetic Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
igneous
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Pink Granite
Granite (Felsic plutonic rock)
igneous
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granodiorite (Weathered)
Granodiorite
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Bog Iron (Limonite)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossiliferous Limestone
Biomicrite / Limestone with fossils
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Amethyst (Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Carbonado (Black Diamond)
Carbonado (Polycrystalline Diamond)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with chromium/vanadium impurities
mineral
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Quartz with Iron Stains
Silicon Dioxide (SiO2) with FeOx inclusions
mineral
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt
igneous
Quartzite
Crystalline silica (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based typically)
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Schist (muscovite/biotite rich)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral