Mineral Group

Browse mineral group specimens identified by the Rock Identifier community.

Spinifex Textured Komatiite

Komatiite (Mg-rich ultramafic volcanic rock)

igneous

Red Garnet

Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)

Mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

mineral

Belemnite (Fossilized Rostrum)

Belemnitida (Order), composed of Calcite (CaCO3)

sedimentary

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Amazonite

Amazonite (KAlSi3O8, a triclinic variety of Potassium Feldspar)

mineral

Granitic Pegmatite with Schorl

Granitic Pegmatite (Schorl: NaFe3Al6(Si6O18)(BO3)3(OH)3OH)

igneous

Garnet (likely Almandine or Pyrope)

Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)

Mineral

Lapis Lazuli

Lapis lazuli (primary component: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

metamorphic

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

mineral

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with Ni impurities)

mineral

Basalt (Purple-tinted scoria/vesicular variety)

Extrusive mafic igneous rock (SiO2 range 45–52%)

igneous

Basalt

Extrusive mafic igneous rock

igneous

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

mineral

Spinosaurus Tooth Fossil

Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)

sedimentary

Pyrope Garnet (Bohemian Garnets)

Pyrope (from the group Mg3Al2(SiO4)3)

mineral

Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)

Mixed Silicates and Oxides (predominantly SiO2 group minerals)

mineral

Red Garnet

Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)

Mineral

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

metamorphic

Kyanite

Kyanite (Al2SiO5)

Mineral

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Mineral

Serpentinite

Serpentinite (composed primarily of minerals in the Serpentine group)

metamorphic

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Mineral

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Mineral

Fossil Bivalve Shell

Class Bivalvia (e.g., Veneriidae family)

sedimentary

Apache Tear

Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)

igneous

Trilobite Fossil

Trilobita (Class), likely Phacopid or Asaphid order

sedimentary

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

mineral

Almandine Garnet

Iron aluminum silicate - Fe3Al2(SiO4)3

metamorphic

Fossil Brachiopod Cast (Atrypa species)

Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida

sedimentary

Serpentinite

Serpentinite (group of hydrous magnesium iron phyllosilicates)

metamorphic

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Mineral

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mineral