Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Category
Browse mineral (found in igneous and metamorphic rocks) specimens identified by the Rock Identifier community.
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Milky Quartz (or Iron-Stained Quartz)
Quartz (Silicon Dioxide, SiO2)
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
Common Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Magnetite
Iron(II,III) oxide (Fe3O4)
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Epidote with quartz/feldspar
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Magnetite with Quartz
Magnetite (Fe3O4)
Garnet
Pyrope or Almandine (X3Y2(SiO4)3)
Muscovite
KAl2(AlSi3O10)(OH)2
Milky Quartz in Siltstone or Feldspar
Silicon Dioxide (SiO2)
Potassium Feldspar (Microcline / Orthoclase)
KAlSi3O8
Hematite
Iron(III) oxide (Fe2O3)
Pyrite in Matrix
Iron Sulfide (FeS2)
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
Chrysocolla
Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
Sodalite
Na8(Al6Si6O24)Cl2
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Labradorite
(Ca,Na)(Al,Si)4O8
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Quartz
SiO2 (Silicon Dioxide)
White Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Ruby (varieties of Corundum)
Aluminum oxide (Al2O3) with Chromium traces
Likely quartz fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock
Peacock Ore
Bornite (Cu5FeS4)
Quartz Sand Gravel
Silicon Dioxide (SiO2)
Labradorite
(Ca,Na)(Al,Si)4O8 (Plagioclase Feldspar)
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Clear Quartz
Silicon Dioxide (SiO2)
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)