Mongolite Mineral Data

Mongolite Mineral Data +

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General Mongolite Information

Chemical Formula:

Ca4Nb6Si5O24(OH)10·5(H2O)

Composition:

Molecular Weight = 1,502.31 gm

Calcium 10.67 % Ca 14.93 % CaO

Niobium 37.11 % Nb 53.08 % Nb₂O₅

Silicon 9.35 % Si 20.00 % SiO₂

Hydrogen 1.34 % H 11.99 % H₂O

Oxygen 41.53 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Nb₆Si₅O₂₄(OH)₁₀·5(H₂O)

Environment:

Agpaitic pegmatites in alkalic granite.

IMA Status:

Approved IMA 1985

Locality:

Khan-Bogdinsky massif, Gobi desert, Mongolia, China. Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Mongolite Image

Images:

Mongolite

Comments: White to pinkish massive mongolite.
Location: Khan-Bogdinskii massif, Gobi Desert, Mongolia. Scale: Picture size 6 mm.
© Thomas Witzke / Abraxas-Verlag

Mongolite Crystallography

Axial Ratios:

a:c = 1:4.14428

Cell Dimensions:

a = 7, c = 29.01, Z = 2; V = 1,421.49 Den(Calc)= 3.51

Crystal System:

TetragonalSpace Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.163(1), 2.974(0.7), 3.087(0.65),

Physical Properties of Mongolite

Cleavage:

[001] Good

Color:

Gray lilac, Light violet.

Density:

3.147 - 3.15, Average = 3.14

Diaphaniety:

Transparent

Habit:

Foliated - Two dimensional platy forms.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

2 - Gypsum

Luster:

Silky

Streak:

white

Optical Properties of Mongolite

Gladstone-Dale:

CI meas= 0.045 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.143 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2194,KPDmeas= 0.2446,KC= 0.256

Optical Data:

Uniaxial (-), e=1.74, w=1.8, bire=0.0600.

Calculated Properties of Mongolite

Electron Density:

r_electron=3.05 gm/cc
note: r_Mongolite=3.15 gm/cc.

Fermion Index

Fermion Index = 0.00471
Boson Index = 0.99529

Photoelectric:

PE_Mongolite= 55.88 barns/electron
U=PE_Mongolite x r_electron= 170.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mongolite is Not Radioactive

Mongolite Classification

Dana Class:

56.2.4.15 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.4)Cuspidine - Wohlerite group

56.2.4.1 Baghdadite Ca3(Zr,Ti)Si2O9 P 2₁/a 2/m

56.2.4.2 Burpalite Na2CaZrSi2O7F2 P 2₁/a 2/m

56.2.4.3 Cuspidine Ca4Si2O7(F,OH)2 P 2₁/c 2/m

56.2.4.4 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 2₁/a 2/m

56.2.4.5 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 2₁/m 2/m

56.2.4.6 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m

56.2.4.7 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1

56.2.4.8 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1

56.2.4.9 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1

56.2.4.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 2₁/n 2/m

56.2.4.11 Jennite Ca9Si6O18(OH)6·8H2O P1 1

56.2.4.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2·3.5(H2O) Unk Ortho

56.2.4.13 Na-komarovite? Na6CaNb6[Si4O12F2·4(H2O) C mmm 2/m 2/m 2/m

56.2.4.14 Suolunite Ca2Si2O5(OH)2·(H2O) F dd2 mm2

56.2.4.15 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra

56.2.4.16 Kristiansenite! Ca2ScSn(Si2O7)(Si2O6OH) C1 1

56.2.4.17 Kochite! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1

Strunz Class:

VIII/B.15-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.15 - Mongolite series

VIII/B.15-10 Mongolite Ca4Nb6Si5O24(OH)10·5(H2O) Unk Tetra

Other Mongolite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Mongolite

Ca4Nb6Si5O24(OH)10·5(H2O)
Dana No: 56.2.4.15 Strunz No: VIII/B.15-10
Locality:

Notes: