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Montdorite

Formula:
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
[(OH,F)
 
2
|Si
 
4
O
 
10
]
 
2
Name:For the type locality
This page provides mineralogical data about Montdorite.

Classification of Montdorite

IMA status:Approved
Strunz 8th edition ID:8/H.11-40
Nickel-Strunz 10th (pending) edition ID:9.EC.15

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
Dana 8th edition ID:71.2.2a.10

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
Hey's CIM Ref.:14.20.9

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals
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Type Occurrence of Montdorite

Type Locality:Charlannes, La Bourboule, Monts-Dore massif, Puy-de-Dôme, Auvergne, France

Optical Data of Montdorite

Type:Biaxial (-)
RI values: nα = 1.580 nβ = 1.605 nγ = 1.605
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Montdorite

Formula:
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
[(OH,F)
 
2
|Si
 
4
O
 
10
]
 
2
Essential elements:Fe, H, K, O, Si
All elements listed in formula:F, Fe, H, K, Mg, Mn, Na, O, Si

Relationship of Montdorite to other Species

Related to:
  • Mica Group
  • Related Minerals - Nickel-Strunz Grouping):
    9.EC.05Minnesotaite
    (Fe,Mg)
     
    3
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.05Talc
    Mg
     
    3
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.05Willemseite
    (Ni,Mg)
     
    3
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.10Ferripyrophyllite
    Fe
     
    2
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.10Pyrophyllite
    Al
     
    2
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.15Boromuscovite
    KAl
     
    2
    [(OH)
     
    2
    |BSi
     
    3
    O
     
    10
    ]
    9.EC.15Celadonite
    K(Mg,Fe
    2+
     
    )(Fe
    3+
     
    ,Al)[(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.15Chernykhite
    (Ba,Na)(V
    3+
     
    ,Al,Mg)
     
    2
    [(OH)
     
    2
    |(Si,Al)
     
    4
    O
     
    10
    ]
    9.EC.15Muscovite
    KAl
     
    2
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.15Nanpingite
    CsAl
     
    2
    [(OH,F)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.15Paragonite
    NaAl
     
    2
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.15Roscoelite
    K(V,Al)
     
    2
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.15Tobelite
    (NH
     
    4
    ,K)Al
     
    2
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.15Aluminoceladonite
    K(Mg,Fe
    2+
     
    )(Al,Fe
    3+
     
    )[(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.15Chromphyllite
    K(Cr,Al)
     
    2
    [(OH,F)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.15Ferro-aluminoceladonite
    K(Fe
    2+
     
    ,Mg)(Al,Fe
    3+
     
    )[(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.15Ferroceladonite
    K(Fe
    2+
     
    ,Mg)(Fe
    3+
     
    ,Al)[(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.15Chromceladonite
    K(Mg,Fe
    2+
     
    )(Cr,Al)[(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.15Tainiolite
    KLiMg
     
    2
    [F
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.15Ganterite
    (Ba,Na,K)(Al,Mg)
     
    2
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Annite
    KFe
    2+
    3
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Biotite
    9.EC.20Ephesite
    NaLiAl
     
    2
    [(OH)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.20Hendricksite
    K(Zn,Mg,Mn
    2+
     
    )
     
    3
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Masutomilite
    (K,Rb)(Li,Mn
    3+
     
    ,Al)
     
    3
    [(F,OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Norrishite
    KLiMn
    2+
    2
    [(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.20Phlogopite
    KMg
     
    3
    [(OH,F)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Polylithionite
    KLi
     
    2
    Al[(F,OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.20Preiswerkite
    NaMg
     
    2
    Al[(OH)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.20Siderophyllite
    KFe
    2+
    2
    Al[(F,OH)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.20Tetra-ferriphlogopite
    KMg
     
    3
    [(OH,F)
     
    2
    |(Fe
    3+
     
    ,Al)Si
     
    3
    O
     
    10
    ]
    9.EC.20Wonesite
    (Na,K)(Mg,fe,Al)
     
    6
    (Al,Si)
     
    8
    O
     
    20
    (OH,F)
     
    4
    9.EC.20Zinnwaldite
    KLiFe
    2+
     
    Al[(F,OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Eastonite
    KMg
     
    2
    Al[(OH)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.20Tetraferriannite
    KFe
    2+
    3
    [(OH)
     
    2
    |(Fe
    3+
     
    ,Al)Si
     
    3
    O
     
    10
    ]
    9.EC.20Trilithionite
    K(Li,Al)
     
    3
    [(F,OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Fluorannite
    KFe
    2+
    3
    [(F,OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Shirokshinite
    KNaMg
     
    2
    [F
     
    2
    |Si
     
    4
    O
     
    10
    ]
    9.EC.20Shirozulite
    K(Mn
    2+
     
    ,Mg)
     
    3
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Sokolovaite
    CsLi
     
    2
    AlSi
     
    4
    O
     
    10
    F
     
    2
    9.EC.20Aspidolite
    NaMg
     
    3
    [(OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.20Fluorophlogopite
    KMg
     
    3
    [(F,OH)
     
    2
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.25Brammallite
    Na
     
    0.65
    Al
     
    2.0
    ٱAl
     
    0.65
    Si
     
    3.35
    O
     
    10
    (OH)
     
    2
    9.EC.30Margarite
    CaAl
     
    2
    [(OH)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.35Anandite
    (Ba,K)(Fe
    2+
     
    ,Mg)
     
    3
    [(O,OH)
     
    2
    |(Si,Al,Fe)
     
    4
    O
     
    10
    ]
    9.EC.35Bityite
    CaLiAl
     
    2
    [(OH)
     
    2
    |BeAlSi
     
    2
    O
     
    10
    ]
    9.EC.35Clintonite
    Ca(Mg,Al)
     
    3
    [(OH)
     
    2
    |Al
     
    3
    SiO
     
    10
    ]
    9.EC.35Kinoshitalite
    (Ba,K)(Mg,Mn
    2+
     
    ,Al)
     
    3
    [(OH)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.35Ferrokinoshitalite
    (Ba,K)(Fe
    2+
     
    ,Mg)
     
    3
    [(OH,F)
     
    2
    |Al
     
    2
    Si
     
    2
    O
     
    10
    ]
    9.EC.35Oxykinoshitalite
    (Ba,K)(Mg,Ti,Fe
    3+
     
    ,Fe
    2+
     
    )
     
    3
    [(O,OH,F)
     
    2
    |(Si,Al)
     
    4
    O
     
    10
    ]
    9.EC.40Beidellite
    (Na,Ca
     
    0.5
    )
     
    0.3
    Al
     
    2
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    ·nH
     
    2
    O
    9.EC.40Kurumsakite
    (Zn,Ni,Cu)
     
    8
    Al
     
    8
    V
     
    2
    Si
     
    5
    O
     
    35
    ·27H
     
    2
    O (or near)
    9.EC.40Montmorillonite
    (Na,Ca)
     
    0.33
    (Al,Mg)
     
    2
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    ·nH
     
    2
    O
    9.EC.40Nontronite
    Na
     
    0.3
    Fe
     
    2
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    ·nH
     
    2
    O
    9.EC.40Volkonskoite
    Ca
     
    0.3
    (Cr,Mg,Fe)
     
    2
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    ·4H
     
    2
    O
    9.EC.40Yakhontovite
    (Ca,Na)
     
    0.5
    (Cu,Fe,Mg)
     
    2
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    ·3H
     
    2
    O
    9.EC.40Smectite
    9.EC.45Hectorite
    Na
     
    0.3
    (Mg,Li)
     
    3
    Si
     
    4
    O
     
    10
    (F,OH)
     
    2
    9.EC.45Saponite
    Ca
     
    0.25
    (Mg,Fe)
     
    3
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    ·nH
     
    2
    O
    9.EC.45Sauconite
    Na
     
    0.3
    Zn
     
    3
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    ·4H
     
    2
    O
    9.EC.45Spadaite
    MgSiO
     
    2
    (OH)
     
    2
    ·H
     
    2
    O
    9.EC.45Stevensite
    (Ca,Na)
     
    x
    Mg
     
    3
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.45Swinefordite
    Li(Al,Li,Mg)
     
    4
    (Si,Al)
     
    8
    O
     
    20
    ,(OH,F)
     
    4
    ·xH
     
    2
    O
    9.EC.45Zincsilite
    Zn
     
    3
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    ·4H
     
    2
    O
    9.EC.45Ferrosaponite
    Ca
     
    0.3
    (Fe
    2+
     
    ,Mg,Fe
    3+
     
    )
     
    3
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    ·4H
     
    2
    O
    9.EC.50Vermiculite
    (Mg,Fe,Al)
     
    3
    (Al,Si)
     
    4
    O
     
    10
    (OH)
     
    2
    ·4H
     
    2
    O
    9.EC.55Baileychlore
    (Zn,Fe,Al,Mg)
     
    6
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    8
    9.EC.55Chamosite
    (Fe
    2+
     
    ,Mg)
     
    5
    Al[(OH)
     
    8
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.55Clinochlore
    (Mg,Fe
    2+
     
    )
     
    5
    Al[(OH)
     
    8
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.55Cookeite
    LiAl
     
    4
    (Si
     
    3
    Al)O
     
    10
    (OH)
     
    8
    9.EC.55Franklinfurnaceite
    Ca
     
    2
    FeMn
     
    3
    MnZn
     
    2
    Si
     
    2
    O
     
    10
    (OH)
     
    8
    9.EC.55Gonyerite
    (Mn,Mg)
     
    5
    Fe(Si
     
    3
    Fe)O
     
    10
    (OH)
     
    8
    9.EC.55Nimite
    (Ni,Mg,Al)
     
    6
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    8
    9.EC.55Orthochamosite
    (Fe,Mg,Fe)
     
    5
    Al(Si
     
    3
    Al)O
     
    10
    (OH,O)
     
    8
    9.EC.55Pennantite
    (Mn
     
    5
    Al)(Si
     
    3
    Al)O
     
    10
    (OH)
     
    8
    9.EC.55Sudoite
    (Mg,Fe
    2+
     
    )
     
    2
    Al
     
    3
    [(OH)
     
    8
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.55Donbassite
    Al
     
    2
    [Al
     
    2.33
    ][Si
     
    3
    AlO
     
    10
    ](OH)
     
    8
    9.EC.55Glagolevite
    Na(Mg,Al)
     
    6
    [(OH,O)
     
    8
    |AlSi
     
    3
    O
     
    10
    ]
    9.EC.55Borocookeite
    Li
     
    1+3x
    Al
     
    4-x
    [(BSi
     
    3
    )O
     
    10
    ](OH)
     
    8
    [0.00 <= x <=0.33]
    9.EC.60Aliettite
    Ca
     
    0.2
    Mg
     
    6
    (Si,Al)
     
    8
    O
     
    20
    (OH)
     
    4
    ·4H
     
    2
    O
    9.EC.60Corrensite
    (Mg,Fe)
     
    9
    (Si,Al)
     
    8
    O
     
    20
    (OH)
     
    10
    ·nH
     
    2
    O
    9.EC.60Dozyite
    Mg
     
    7
    Al
     
    2
    [(OH)
     
    12
    |Al
     
    2
    Si
     
    4
    O
     
    15
    ]
    9.EC.60Hydrobiotite
    9.EC.60Karpinskite
    (Ni,Mg)
     
    2
    Si
     
    2
    O
     
    5
    (OH)
     
    2
    9.EC.60Kulkeite
    Mg
     
    8
    Al(AlSi
     
    7
    )O
     
    20
    (OH)
     
    10
    9.EC.60Lunijianlaite
    Li
     
    0.7
    Al
     
    6.2
    (Si
     
    7
    AlO
     
    20
    )(OH,O)
     
    10
    9.EC.60Rectorite
    (Na,Ca)Al
     
    4
    (Si,Al)
     
    8
    O
     
    20
    (OH)
     
    4
    ·2H
     
    2
    O
    9.EC.60Saliotite
    Li
     
    0.5
    Na
     
    0.5
    Al
     
    3
    Si
     
    3
    AlO
     
    10
    (OH)
     
    5
    9.EC.60Tosudite
    9.EC.60Brinrobertsite
    Na
     
    0.3
    Al
     
    4
    [(OH)
     
    2
    |Si
     
    4
    O
     
    10
    ]
     
    2
    · 3.5 H
     
    2
    O
    9.EC.65Macaulayite
    (Fe,Al)
     
    24
    Si
     
    4
    O
     
    43
    (OH)
     
    2
    9.EC.70Burckhardtite
    Pb
     
    2
    (Fe,Mn)AlTeO
     
    2
    Si
     
    3
    O
     
    10
    (OH)
     
    2
    ·H
     
    2
    O
    9.EC.75Ferrisurite
    (Pb,Ca)
     
    2-3
    (CO
     
    3
    )
     
    1.5-2
    (OH,F)
     
    0.5-1
    [(Fe,Al)
     
    2
    Si
     
    4
    O
     
    10
    (OH)
     
    2
    ]·nH
     
    2
    O
    9.EC.75Surite
    Pb(Pb,Ca)(CO
     
    3
    )
     
    2
    (Al,Fe,Mg)
     
    2
    (Si,Al)
     
    4
    O
     
    10
    (OH)
     
    2
    9.EC.75Niksergievite
    (Ba,Ca)
     
    2
    (Al,Si)
     
    7
    O
     
    10
    (CO
     
    3
    )(OH)
     
    6
    ·nH
     
    2
    O
    9.EC.80Kegelite
    Pb
     
    12
    (Zn,Fe)
     
    2
    Al
     
    4
    (SO
     
    4
    )
     
    4
    Si
     
    11
    O
     
    38
    or near
    Related Minerals - Hey's Index Grouping:
    14.20.1Emeleusite
    Li
     
    2
    Na
     
    4
    Fe
     
    2
    Si
     
    12
    O
     
    30
    14.20.2Aegirine
    NaFe
    3+
     
    [Si
     
    2
    O
     
    6
    ]
    14.20.4Wilkinsonite
    Na
     
    2
    Fe
    2+
    4
    Fe
    3+
    2
    [O
     
    2
    |Si
     
    6
    O
     
    18
    ]
    14.20.5Tuperssuatsiaite
    Na
     
    2
    Fe
     
    3
    Si
     
    8
    O
     
    20
    (OH)
     
    2
    ·4H
     
    2
    O
    14.20.6Riebeckite
    [ ][Na
     
    2
    ][Fe
    2+
    3
    Fe
    3+
    2
    ][(OH)
     
    2
    |Si
     
    8
    O
     
    22
    ]
    14.20.7 Ferri-annite
    14.20.8Fenaksite
    (K,Na)
     
    4
    (Fe,Mn)
     
    2
    (Si
     
    4
    O
     
    10
    )
     
    2
    (OH,F)

    Other Names for Montdorite

    German names:
    Montdorit
    Spanish names:
    Montdorita

    Other Information

    Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

    References for Montdorite

    Reference List:Robert J.-L. & Maury R.C. (1979): Contributions to Mineralogy and Petrology 68, 117-123.

    American Mineralogist (1979): 64: 1331.

    Canadian Mineralogist (1998): 36: 905-912.

    Internet Links for Montdorite

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  • Raman and XRD data at RRUFF project
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    Localities for Montdorite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Algeria
     
    • Annaba Province
      • Cap de Fer
    Eur. J. Mineral. , 1996, 8, pp. 625-638.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Monts-Dore massif
          • La Bourboule
    Robert JL, Maury RC (1979) Natural occurrence of a (Fe, Mn, Mg) tetrasilicic potassium mica. Contrib. Mineral. Petrol. 68: 117-123
    Kenya
     
    • Rift Valley Province
      • Hell’s Gate National Park
    Mineralogical Magazine, August 1998, V. 62, N° 4, pp. 477-486. / Journal of Petrology, Vol. 42, N° 4, pp. 825-845, 2001. / Mineralogical Magazine, Volume 66, Number 2, 1 April 2002, pp. 287-299(13) / The United Nations University, GEOTHERMAL TRAINING PROGRAMME Reports 2004, Number 1, Orkustofnun, Grensásvegur 9, IS-108 Reykjavík, Iceland
    Mineral and/or Locality
    Google
     
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