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Mongolite

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Dorozhnyi pegmatite, Khan Bogdo (Khan-Bogdinskii) massif, Gobi Desert, Mongolia
© Pavel M. Kartashov

Show Mongolite Photos (6)
Formula:
Ca
 
4
Nb
 
6
Si
 
5
O
 
24
(OH)
 
10
·nH
 
2
O
System:TetragonalHardness:2
This page provides mineralogical data about Mongolite.

Classification of Mongolite

IMA status:Approved
Strunz 8th edition ID:8/B.15-10
Nickel-Strunz 10th (pending) edition ID:9.HF.05

9 : SILICATES (Germanates)
H : Unclassified silicates
F : With Nb, Ta, Zr
Dana 8th edition ID:56.2.4.15

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
2 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordination
Hey's CIM Ref.:17.8.5

17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
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Type Occurrence of Mongolite

Type Locality:Dorozhnyi pegmatite, Khan Bogdo (Khan-Bogdinskii) massif, Gobi Desert, Mongolia
Year of Discovery:1985

Physical Properties of Mongolite

Hardness (Mohs):2

Crystallography of Mongolite

Crystal System:Tetragonal
Cell Parameters:a = 7Å, c = 29.01Å
Ratio:a:c = 1 : 4.144
Unit Cell Volume:V 1,421.49 ų (Calculated from Unit Cell)

Optical Data of Mongolite

Type:Uniaxial (-)
RI values: nω = 1.800 nε = 1.740
Maximum Birefringence:δ = 0.060

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Mongolite

Formula:
Ca
 
4
Nb
 
6
Si
 
5
O
 
24
(OH)
 
10
·nH
 
2
O
Essential elements:Ca, H, Nb, O, Si
All elements listed in formula:Ca, H, Nb, O, Si
Common Impurities:Ti,Al,Mn,Zn,Mg,Sr,Ba,Na,K

Relationship of Mongolite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HF.10Loudounite
NaCa
 
5
Zr
 
4
Si
 
16
O
 
40
(OH)
 
11
·8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
17.8.1Epistolite
Na
 
2
(Nb,Ti)
 
2
[O
 
2
|Si
 
2
O
 
7
] · nH
 
2
O
17.8.2Murmanite
Na
 
2
(Ti,Nb)
 
2
Si
 
2
O
 
9
·nH
 
2
O
17.8.3Perraultite
BaNaTi
 
2
 Mn
2+
4
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
17.8.4Niocalite
(Ca,Nb)
 
4
[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
17.8.6Fersmanite
(Ca,Na)
 
4
(Ti,Nb)
 
2
Si
 
2
O
 
11
(F,OH)
 
2
17.8.7Nacareniobsite-(Ce)
Na
 
3
Ca
 
3
(Ce,La,Nd)Nb[F
 
3
|O|(Si
 
2
O
 
7
)
 
2
]
17.8.8Nenadkevichite
(Na,[])
 
8
Nb
 
4
(Si
 
4
O
 
12
)
 
2
(O,OH)
 
4
·8H
 
2
O
17.8.9Natrokomarovite
(Na,Ca,H)
 
2
Nb
 
2
Si
 
2
O
 
10
(OH,F)
 
2
·H
 
2
O
17.8.10Wöhlerite
NaCa
 
2
(Zr,Nb)[(O,OH,F)
 
2
|Si
 
2
O
 
7
]
17.8.11Belkovite
Ba
 
3
(Nb,Ti)
 
6
[O
 
6
|Si
 
2
O
 
7
]
 
2
17.8.12Baotite
Ba
 
4
(Ti,Nb)
 
8
Si
 
4
O
 
28
Cl
17.8.13Shcherbakovite
Na(K,Ba)
 
2
(Ti,Nb)
 
2
[O|Si
 
2
O
 
6
]
 
2
17.8.14Ilímaussite-(Ce)
(Na,K)
 
7-8
(Ba,K)
 
10
Ce
 
5
(Nb,Ti)
 
6
[O
 
6
|Si
 
9
O
 
18
(O,OH)
 
24
|(Si
 
6
O
 
18
)
 
2
]
17.8.15Komarovite
(Ca,Mn)Nb
 
2
[O
 
3
|Si
 
2
O
 
7
] · 3.5H
 
2
O
17.8.16Manganbelyankinite
(Mn,Ca)(Ti,Nb)
 
5
O
 
12
·9H
 
2
O
17.8.17Niobophyllite
(K,Na)
 
3
(Fe,Mn)
 
6
(Nb,Ti)
 
2
Si
 
8
(O,OH,F)
 
31
17.8.18Caesium-Kupletskite

Other Names for Mongolite

Synonyms:
IMA1983-027
Other Languages:
German:Mongolit
Spanish:Mongolita

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 Mongolite

Reference List:American Mineralogist (1986): 71: 1279.

Internet Links for Mongolite

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  • Raman and XRD data at RRUFF project
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  • Mongolite details from Handbook of Mineralogy (PDF)
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    Localities for Mongolite

    (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.
    Mongolia
     
    • Gobi Desert
      • Khan Bogdo (Khan-Bogdinskii) massif
    		Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society) (and Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva) (1985): 114, 374-377.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
    Mineral and/or Locality
    Google
     
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