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Mineral Index - O

• Oakermanite
  syn. of Åkermanite

• Oakite
  syn. of Lithiophorite

• Oakstone
  var. of Baryte

• Obertiite
  Monoclinic
  [Na][Na₂][Mg₃(Ti,Fe³⁺,Mn³⁺)₂][O₂|Si₈O₂₂]

• Oboite
  syn. of Oborite

• Oborite
  An uncharacterised rare earth mineral. Minute grains in Fluorite. Originally reported from Bayan Obo (Bayun-Obo; Baiyunebo) deposit, Darhan Muminggan United Banner, Baotou League, Nei Mongol Autonomous Region (Inner Mongolia), China.

• Oboyerite
  Triclinic
  Pb₆H₆[(Te⁴⁺O₃)₃|(Te⁶⁺O₆)₂] · 2H₂O
• Obradovicite
  Orthorhombic
  H₄(K,Na)CuFe₂AsO₄(MoO₄)₅·12H₂O

• Obruchevite
  syn. of Yttropyrochlore-(Y)

• Obsidian
  Volcanic glass - a rock rather than a mineral, it is a mixture of cryptocrystalline grains of silica minerals in a glass-like suspension, a super-cooled liquid. Obsidian is formed in the latest stage of volcanic eruptions, the silicas left over ...

• Occidental Turquois
  syn. of Occidental Turquoise

• Occidental Turquoise
  Much Occidental Turquoise is fossilized bone or teeth consisting of microcrystalline apatite. Originally thought to be coloured by vivianite, or perhaps by copper salts, recent research has suggested that the original material was fossilized ...

• Ocean Agate
  syn. of Orbicular Jasper

• Ocean Jasper
  syn. of Orbicular Jasper

• Oceanjaspis
  syn. of Orbicular Jasper, Orbicular Jasper

• Ocher
  syn. of Ochre

• Ochra Cobalti rubra
  syn. of Erythrite

• Ochran
  A yellow clay material - an aluminosilicate of Fe3+ [Briethaupt, 1832, 100 - "Char.Min.-Syst. 3rd ed."] Originally reported from Elizabeth Mine, Oraviţa (Oravicza), Caras-Severin Co., Romania.

• Ochra niccoli
  syn. of Annabergite

• Ochra rubra
  syn. of Hematite

• Ochre
  syn. of Antimony Ochre, Iron Ochre, Lead Ochre, Molybdic Ochre

• Ochrolite
  syn. of Nadorite

• Ochrolith
  syn. of Nadorite

• Ocre martiale bleue
  syn. of Vivianite

• Ocrite
  A group name for powdery ochres.

• Octaedrisches Phosphorkupfer
  syn. of Libethenite

• Octaèdrite
  syn. of Anatase

• Octahedral Arseniate of Copper
  syn. of Liroconite

• Octahedral Borax
  syn. of Tincalconite

• Octahedral Copper
  syn. of Cuprite

• Octahedral Copper Ore
  syn. of Cuprite

• Octahedral Iron Ore
  syn. of Magnetite

• Octahedrite
  syn. of Anatase

• Octibbehite
  syn. of Oktibbehite

• Octophyllite
  A group name for micas containing eight cations, primarily the dark micas.

• O'Danielite
  Na(Zn,Mg)₃H₂(AsO₄)₃

• Odenite
  syn. of Biotite

• Oderite
  syn. of Biotite

• Odinite
  (Fe,Mg,Al,Fe,Ti,Mn)_2.4(Si,Al)₂O₅(OH)₄
• Odintsovite
  Orthorhombic
  K₂Na₄Ca₃Ti₂Be₄Si₁₂O₃₈

• Odite
  syn. of Biotite

• Odontolite
  syn. of Occidental Turquoise

• Oeil de fer
  mixture of Hematite, Quartz

• Oeil de perdrix
  syn. of Leucite

• Oeil-de-tigre
  syn. of Tiger's Eye

• Oellacherite
  syn. of Barian Muscovite

• Oelstein
  syn. of Nepheline

• Oenite
  Orthorhombic
  CoSbAs

• O-enstatite
  syn. of Enstatite

• Oerstedite
  var. of Zircon

• Oesterdite
  syn. of Zircon

• Oesterreicher
  syn. of Diamond

• O-ferrosilite
  syn. of Ferrosilite

• Offretite
  Hexagonal
  KCaMgAl₅Si₁₃O₃₆·16H₂O or near

• Offrétite
  syn. of Offretite

• Oftedalite
  Hexagonal
  (Sc,Ca,Mn²⁺)₂K[(Be,Al)₃Si₁₂O₃₀]

• Ogcoite
  syn. of Ripidolite

• Ogdensburgite
  Orthorhombic
  Ca₂Fe³⁺₄(Zn,Mn²⁺)[(OH)₃|(AsO₄)₂]₂ · 6H₂O

• Ohenicochroite
  syn. of Phoenicochroite

• Ohmilite
  Monoclinic
  Sr₃(Ti,Fe³⁺)[(O,OH)|(Si₂O₆)₂] · 2-3H₂O

• Oil Quartz
  var. of Quartz

• Oisanite
  syn. of Anatase

• Oisanite (of de Saussure)
  syn. of Epidote

• Oisanite (of Klaproth)
  syn. of Axinite Group

• Oisannite
  syn. of Axinite Group

• Ojuelaite
  Monoclinic
  ZnFe³⁺₂(AsO₄)₂(OH)₂ · 4H₂O
• Okanoganite-(Y)
  (Na,Ca)₃(Y,Ce)₁₂Si₆B₂O₂₇F₁₄
• Okayamalite
  Tetragonal
  Ca₂B[BSiO₇]
• Okenite
  Triclinic
  CaSi₂O₅·2H₂O

• Okenite (of Rink)
  syn. of Wollastonite

• Okermanite
  syn. of Åkermanite

• Okhotskite
  Monoclinic
  Ca₈(Mn²⁺,Mg)₄(Mn³⁺,Al,Fe)₈Si₁₂O_56-n(OH)_n

• Okhotskite-(Mg)
  
  Monoclinic
  Ca₈(Mn²⁺,Mg)(Mn³⁺,Al,Fe³⁺)(SiO₄)(Si₂O₇)(OH)₂·H₂O

• Okhotskite-(Mn2+)
  syn. of Okhotskite
  Monoclinic

• Oktaëdrisches Ttaneisen-Oxyd
  syn. of Iserine