Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Serpentinite-bearing quartz vein rock
Serpentinite (antigorite/lizardite) with milky quartz; possible chlorite or epidote alteration
metamorphic
White Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
mineral
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Green Jasper / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper / Chert Pebbles
Microcrystalline Quartz (SiO2)
sedimentary
Native copper-bearing rock
Native copper (Cu), likely with copper oxides/carbonates in a host rock
mineral
Green Common Opal
Hydrated Silica (SiO2·nH2O)
mineral
Aragonite (Onyx Marble)
Calcium Carbonate (CaCO3), Orthorhombic crystal system
mineral
Unidentified gray-brown stone
Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Labradorite
Labradorite (a calcium-enriched sodic plagioclase feldspar)
mineral
Biotite (Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Smoky Quartz occurring with Feldspar
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)
mineral
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Chondrite Meteorite Fragment
Ordinary Chondrite (L or H type)
igneous
Grey Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Aquamarine
Beryllium Aluminum Silicate (Be3Al2Si6O18)
gemstone
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral
Green Jasper (Banded Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide and dark silicate inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled)
Silicon Dioxide (Quartz) with traces of Iron; SiO2
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Granite
Felsic intrusive igneous rock
igneous
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Beryl (Aquamarine)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Sillimanite
Al2O3(SiO2)
mineral
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite ((Mn2+,Fe2+,Mg,Ca)SiO3)
metamorphic
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Garnet
Almandine/Pyrope Garnet (Silicate Mineral Group)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Mixed rock and mineral collection
Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials
mineral
Chert (Jasper-like Silicate)
Silicon Dioxide (SiO2)
sedimentary
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic