Rock Identifier

Category

Mineral Group

Browse mineral group specimens identified by the Rock Identifier community.

Learn about Mineral Group in the encyclopedia

Garnierite

Feldspar

Buergerite

Glauconite

Olenite

Hutcheonite

Eltyubyuite

Euxenite

Banalsite

Knorringite

Plazolite

Katoite

Red garnet (likely almandine or pyrope) (Garnet-group nesosilicate; commonly almandine, Fe₃Al₂(SiO₄)₃, or pyrope, Mg₃Al₂(SiO₄)₃) — gemstone

Red garnet (likely almandine or pyrope)

Garnet-group nesosilicate; commonly almandine, Fe₃Al₂(SiO₄)₃, or pyrope, Mg₃Al₂(SiO₄)₃

Moonstone (Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)) — mineral

Moonstone

Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8)

Amazonite (K(AlSi3O8) - Potassium Aluminum Silicate) — mineral

Amazonite

K(AlSi3O8) - Potassium Aluminum Silicate

Pink Feldspar with Quartz (Potassium Feldspar (Orthoclase) with SiO2) — igneous

Pink Feldspar with Quartz

Potassium Feldspar (Orthoclase) with SiO2

Galena (Lead Sulfide (PbS)) — mineral

Galena

Lead Sulfide (PbS)

Blue apatite (likely rough/tumbled specimen) (Apatite group, commonly fluorapatite — Ca5(PO4)3F) — mineral

Blue apatite (likely rough/tumbled specimen)

Apatite group, commonly fluorapatite — Ca5(PO4)3F

Stilbite (Stilbite-Ca (NaCa4Mg[Al9Si27O72]·28H2O)) — mineral

Stilbite

Stilbite-Ca (NaCa4Mg[Al9Si27O72]·28H2O)

Aragonite (Star Cluster or Twinned variety) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Star Cluster or Twinned variety)

Aragonite (Calcium Carbonate, CaCO3)

Limonite (after Pyrite Pseudomorph) (Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)) — mineral

Limonite (after Pyrite Pseudomorph)

Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)

Polished orbicular jasper (likely ocean jasper) (Silica-rich chalcedony/quartz (SiO₂), with possible iron-oxide and other mineral inclusions) — mineral

Polished orbicular jasper (likely ocean jasper)

Silica-rich chalcedony/quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Serpentine-bearing metamorphic rock (likely chromite/vesuvianite-bearing serpentinite) (Serpentinite, chiefly serpentine-group minerals [(Mg,Fe)₃Si₂O₅(OH)₄], with dark accessory minerals) — metamorphic

Serpentine-bearing metamorphic rock (likely chromite/vesuvianite-bearing serpentinite)

Serpentinite, chiefly serpentine-group minerals [(Mg,Fe)₃Si₂O₅(OH)₄], with dark accessory minerals

K-Feldspar (Potassium Feldspar) (Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8) — mineral

K-Feldspar (Potassium Feldspar)

Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8

Feldspar (specifically Orthoclase or Plagioclase) (Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate) — mineral

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Garnet (Almandine variety) (Almandine Garnet (Fe3Al2(SiO4)3)) — mineral

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Potassium Feldspar (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar

Orthoclase (KAlSi3O8)

Epidote (Epidote (Ca2(Al, Fe)3(SiO4)3(OH))) — mineral

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Feldspar (Orthoclase / Alkali Feldspar) (KAlSi3O8 (Potassium Feldspar / Orthoclase)) — mineral

Feldspar (Orthoclase / Alkali Feldspar)

KAlSi3O8 (Potassium Feldspar / Orthoclase)

Jasper or Agate with Chlorite Inclusions (Silicon Dioxide (SiO2) with Chlorite group minerals) — sedimentary

Jasper or Agate with Chlorite Inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

Serpentinite (Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with magnetite and remnants of olivine/pyroxene) — metamorphic

Serpentinite

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with magnetite and remnants of olivine/pyroxene

Black Tourmaline (Schorl) (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline (Schorl)

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Ironstone Nodules (Limonite/Hematite) (Goethite/Hematite mix (FeO(OH)/Fe2O3)) — sedimentary

Ironstone Nodules (Limonite/Hematite)

Goethite/Hematite mix (FeO(OH)/Fe2O3)

Polished serpentine with veined host rock (Serpentine-group minerals, chiefly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)) — metamorphic

Polished serpentine with veined host rock

Serpentine-group minerals, chiefly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)

Serpentinite (Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)) — metamorphic

Serpentinite

Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)

Greenstone / Serpentinite (Serpentine-group / Altered Mafic Rock) — metamorphic

Greenstone / Serpentinite

Serpentine-group / Altered Mafic Rock

Milky Quartz with Chlorite inclusion (Silicon Dioxide (SiO2) with Chlorite group inclusions) — mineral

Milky Quartz with Chlorite inclusion

Silicon Dioxide (SiO2) with Chlorite group inclusions

Olivine (Peridotite) (Olivine Group; (Mg, Fe)2SiO4) — igneous

Olivine (Peridotite)

Olivine Group; (Mg, Fe)2SiO4

Serpentine (likely polished/tumbled) (Serpentinite; chiefly antigorite, lizardite, and/or chrysotile Mg₃Si₂O₅(OH)₄) — metamorphic

Serpentine (likely polished/tumbled)

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile Mg₃Si₂O₅(OH)₄

Vesicular basalt with secondary crystals (Basalt, likely zeolite- or calcite-lined vesicular basalt) — igneous

Vesicular basalt with secondary crystals

Basalt, likely zeolite- or calcite-lined vesicular basalt

Quartz Pebble with Chlorite or Epidote Inclusions (Silicon Dioxide (SiO2) with inclusions) — metamorphic

Quartz Pebble with Chlorite or Epidote Inclusions

Silicon Dioxide (SiO2) with inclusions

Ruby in Zoisite (Anyolite (Zoisite with Corundum) Member of the Epidote Group) — metamorphic

Ruby in Zoisite

Anyolite (Zoisite with Corundum) Member of the Epidote Group

Enrolled Trilobite Fossil (Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)) — fossil

Enrolled Trilobite Fossil

Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)

Tumbled Moonstone and Amazonite Chips (Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group) — mineral

Tumbled Moonstone and Amazonite Chips

Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group

Eudialyte (Na15Ca6Fe3Zr3Si26O72(OH,Cl)2 (Eudialyte Group)) — mineral

Eudialyte

Na15Ca6Fe3Zr3Si26O72(OH,Cl)2 (Eudialyte Group)

Tumbled greenish quartzite or serpentine (Quartzite (mostly SiO₂) or serpentine-group rock) — metamorphic

Tumbled greenish quartzite or serpentine

Quartzite (mostly SiO₂) or serpentine-group rock

Biotite (Black Mica) (Biotite (K(Mg,Fe)3AlSi3O10(OH)2)) — mineral

Biotite (Black Mica)

Biotite (K(Mg,Fe)3AlSi3O10(OH)2)

Epidote (Epidote (Ca2(Al,Fe)3(SiO4)3(OH))) — mineral

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Garnet (Almandine) (Almandine (Fe3Al2(SiO4)3)) — Mineral

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Sodalite (Na8(Al6Si6O24)Cl2) — mineral

Sodalite

Na8(Al6Si6O24)Cl2

Black Tourmaline (Schorl) (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline (Schorl)

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Polished tiger’s-eye (Quartz variety, chiefly fibrous quartz (SiO₂), with iron-oxide inclusions) — mineral

Polished tiger’s-eye

Quartz variety, chiefly fibrous quartz (SiO₂), with iron-oxide inclusions

Sodalite (Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)