Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Category
Organic Gemstone (Not A Rock Or Mineral)
Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Unidentifiable Rock Fragment
Uncertain
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Banded Agate (Gray Agate)
Silicon Dioxide (SiO2) - Chalcedony
mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Conglomerate
Conglomerate rock
sedimentary
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Granite
Plutonic felsic igneous rock
igneous
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Basalt River Cobble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone
sedimentary
Pearl (as a biogenic mineral/gemstone)
Calcium Carbonate (mostly Aragonite), CaCO3
mineral
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Rough Emerald
Emerald (Beryl), Be3Al2(SiO3)6
mineral
Chert (Grey Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz
Quartz (SiO₂)
Mineral
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite and Calcite inclusions
igneous
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)
metamorphic
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
N/A (The provided image is a storyboard/digital document)
N/A
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Unakite
Unakite (altered granitic rock)
metamorphic
Moonstone
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Fossil Coral (Favosites)
Favosites (Order: Tabulata, Phylum: Cnidaria)
sedimentary
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz Geode (Vug)
Silicon Dioxide (SiO2)
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary