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Mineral Index - M

• Moss Agate
  var. of Chalcedony

• Mossite
  mixture of Columbite-(Fe), Tapiolite

• Moss Opal
  var. of Opal

• Mossottite
  syn. of Strontian Aragonite

• Mother of Opal
  var. of Precious Opal

• Mother of Pearl Opal
  var. of Opal

• Mottanaite-(Ce)
  Monoclinic
  Ca₄(CeCa)AlBe₂(Si₄B₄O₂₂)O₂
• Mottramite
  Orthorhombic
  Pb(Cu,Zn)[OH|VO₄]
• Motukoreaite
  Trigonal
  NaMg₁₉Al₁₂(CO₃)_6.5(SO₄)₄(OH)₅₄·28H₂O

• Mouchketovite
  syn. of Mushketovite

• Mounanaite
  Triclinic
  PbFe³⁺₂[VO₄]₂ · 2(OH,F)

• Mountain Butter
  syn. of Halotrichite

• Mountain Cork
  syn. of Mountain Leather

• Mountain Crystal
  syn. of Rock Crystal

• Mountain Green
  syn. of Malachite

• Mountainite
  Monoclinic
  KNa₂Ca₂[Si₈O₁₉(OH)]·6H₂O

• Mountain Leather
  syn. of Actinolite, Palygorskite, Saponite, Sepiolite, Tremolite

• Mountain Mahogany
  syn. of Mahogany Obsidian

• Mountain Mean
  syn. of Diatomite

• Mountain Opal
  var. of Opal

• Mountain Soap
  syn. of Halloysite

• Mountain Tallow
  syn. of Hatchettite

• Mountain Wood
  syn. of Asbestos, Mountain Leather

• Mountkeithite
  Hexagonal
  (Mg,Ni)₁₁(Fe³⁺,Cr³⁺,Al)₃[(OH)₂₄|(SO₄,CO₃)_3.5] · 11H₂O
• Mourite
  Monoclinic
  UMo₅O₁₂(OH)₁₀

• Mourmanite
  syn. of Murmanite

• Mouschketovite
  syn. of Mushketovite

• Moydite-(Y)
  Y[CO₃|B(OH)₄]

• Mozambikite
  var. of Thorite

• Mozarkite
  syn. of Chert

• Mozartite
  Orthorhombic
  CaMn³⁺[OH|SiO₄]
• Mozgovaite
  Orthorhombic
  PbBi₄(S,Se)₇
• Mpororoite
  AlWO₃(OH)₃·2H₂O
• Mrázekite
  Monoclinic
  Bi₂Cu₃[O|OH|PO₄]₂ · H₂O
• Mroseite
  Orthorhombic
  CaTeO₂CO₃

• Mtorodite
  syn. of Chrome-Chalcedony

• Mtorolite
  syn. of Chrome-Chalcedony

• Mt. St. Helens Stone
  var. of Glass

• Muassanite
  syn. of Moissanite

• Muchinite
  syn. of Mukhinite

• Muchite
  syn. of Muckite

• Muchuanite
  mixture of Jordisite, Molybdenite

• Mückeite
  NiCu(Bi,Sb)S₃

• Muckite
  var. of Retinite

• Muellerite
  syn. of Schertelite

• Muirite
  Tetragonal
  Ba₁₀Ca₂Mn²⁺Ti[(OH,Cl,F)|HSi₂O₇]₅
• Mukhinite
  Monoclinic
  {Ca₂}{Al₂V³⁺}[O|OH|SiO₄|Si₂O₇]

• Muldan
  syn. of Orthoclase

• Mullanite
  syn. of Boulangerite

• Müllerin
  syn. of Krennerite

• Müllerine
  syn. of Krennerite

• Müllerite (of McIvor)
  syn. of Schertelite

• Müller's Glass
  syn. of Opal-AN

• Mullicite
  syn. of Vivianite

• Mullite
  Orthorhombic
  Al₈[(O,OH,F)|(Si,Al)O₄]₄

• Mumbite
  syn. of Plumbomicrolite

• Mummeite
  Monoclinic
  Ag₂CuPbBi₆S₁₃
• Munakataite
  Monoclinic
  Pb₂Cu₂(Se⁴⁺O₃)(SO₄)(OH)₄

• Mundic
  syn. of Pyrite

• Mundite
  Orthorhombic
  Al(UO₂)₃[(OH)₃|(PO₄)₂] · 5.5H₂O
• Mundrabillaite
  Monoclinic
  (NH₄)₂Ca(HPO₄)₂·H₂O
• Munirite
  Monoclinic
  NaVO₃·2H₂O

• Munkforssite
  var. of Apatite

• Munkrudite
  A doubtful, unanalyzed substance supposedly related to Svanbergite.

• Munktenite
  var. of Amber

• Muntenite
  var. of Amber

• Muralite
  var. of Vitrain

• Murataite-(Y)
  Isometric
  (Y,Na)₆Zn(Zn,Fe³⁺)₄(Ti,Nb,Na)₁₂O₂₉(O,F,OH)₁₀F₄

• Murchisonite
  syn. of Orthoclase

• Murdochite
  Isometric
  PbCu₆O_8-x(Cl,Br)_2x x<=0.5

• Muriacite
  syn. of Anhydrite

• Muriate of Ammonia
  syn. of Salammoniac

• Muriate of copper
  syn. of Atacamite

• Muriate of Lead
  syn. of Mendipite

• Muriate of Potash
  syn. of Sylvite