Fossilized Bone
Permineralized Vertebrate Bone
fossil
Category
Mineral (Native Element Alloy)
Browse mineral (native element alloy) specimens identified by the Rock Identifier community.
Learn about Mineral (Native Element Alloy) in the encyclopedia
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Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4 nH2O
mineral
Green Aventurine
SiO2 (Quartz with Fuchsite inclusions)
mineral
Purple Fluorite Octahedron
Fluorite (Calcium Fluoride, CaF2)
mineral
Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)
Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))
mineral
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Limonite with Gold-bearing Quartz
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Limonite / Ironstone
FeO(OH)·nH2O
sedimentary
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Hemimorphite on Limonite Gossan
Hemimorphite (Zn4Si2O7(OH)2·H2O) on Limonite matrix
mineral
Jasper with Purple Fluorite or Chalcedony
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Muscovite
Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-veined Siltstone
Siltstone with Quartz (SiO2) veins
sedimentary
Muscovite Mica
Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))
Mineral
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Hematite Mineral Ore
Iron(III) oxide (Fe2O3)
mineral
Pearl (as a Biogenic Mineral)
Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3
mineral
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Fossilized Shark Tooth (Megalodon or Carcharocles fragment)
Elasmobranchii (Fossilized tooth root / crown section)
fossil
Granodiorite
Granodiorite (intermediate plutonic rock)
igneous
Amethyst Geode
Quartz (SiO2)
mineral
Rounded quartz-rich cobble, likely granite-derived stone
Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica
igneous
Milky quartz (quartz-rich rock)
Quartz, silicon dioxide (SiO₂); likely massive quartz with minor iron-stained impurities
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Green Jasper Pebble
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
White Quartz with Black Tourmaline
Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary