Mongolite Mineral Data
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 % Nb2 O5
Silicon 9.35 % Si 20.00 % SiO2
Hydrogen 1.34 % H 11.99 % H2 O
Oxygen 41.53 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Ca4 Nb6 Si5 O24 (OH)10 •5(H2 O)
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.
Name Pronunciation:
Mongolite + Pronunciation
Mongolite Image
Images:
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:
Tetragonal Space Group: Unk
X Ray Diffraction:
By Intensity(I/Io ): 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
Diaphaneity:
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 Ncalc = 1.81 - 1.9
Optical Data:
Uniaxial (-), e=1.74, w=1.8, bire=0.0600.
Calculated Properties of Mongolite
Electron Density:
Bulk Density (Electron Density)=3.05 gm/cc note: Specific Gravity of Mongolite =3.15 gm/cc.
Fermion Index:
Fermion Index = 0.0047106809 Boson Index = 0.9952893191
Photoelectric:
PEMongolite = 55.88 barns/electronU=PEMongolite x r Electron Density= 170.53 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Mongolite is Not Radioactive
Mongolite Classification
Dana Class:
56.02.04.15 (56) Sorosilicate Si2O7 Groups and O, OH, F. and H2O
(56.02) with cations in [4] and/or >[4] coordination
(56.02.04) Cuspidine - Wohlerite group
56.02.04.01 Baghdadite Ca3(Zr,Ti)Si2O9 P 21 /a 2/m
56.02.04.02 Burpalite Na2CaZrSi2O7F2 P 21 /a 2/m
56.02.04.03 Cuspidine Ca4Si2O7(F,OH)2 P 21 /c 2/m
56.02.04.04 Lavenite (Na,Ca)2(Mn,Fe)(Zr,Ti,Nb)Si2O7(O,OH,F) P 21 /a 2/m
56.02.04.05 Wohlerite NaCa2(Zr,Nb)Si2O7(O,OH,F)2 P 21 /m 2/m
56.02.04.06 Niocalite Ca14Nb2(Si2O7)4O6F2 Pa m
56.02.04.07 Hiortdahlite (Ca,Na,Y)3(Zr,Ti)Si2O7(F,O,OH)2 P1 1
56.02.04.08 Rosenbuschite (Ca,Na)3(Zr,Ti)Si2O8F P1 1
56.02.04.09 Hainite Na4Ca8(Ti,Zr,Mn,Fe)3Si8O28F8 P1 1
56.02.04.10 Janhaugite (Na,Ca)3(Mn,Fe)3(Ti,Zr,Nb)2Si4O15(OH,F,O)3 P 21 /n 2/m
56.02.04.11 Jennite Ca9Si6O18(OH)6•8H2O P1 1
56.02.04.12 Komarovite (Ca,Mn)2(Nb,Ti)2Si2O7(O,F)2•3.5(H2O) Unk Ortho
56.02.04.13 Natrokomarovite * Na6CaNb6[Si4O12F2•4(H2O) C mmm 2/m 2/m 2/m
56.02.04.14 Suolunite Ca2Si2O5(OH)2•(H2O) F dd2 mm2
56.02.04.15 Mongolite Ca4Nb6Si5O24(OH)10•5(H2O) Unk Tetra
56.02.04.16 Kristiansenite ! Ca2ScSn(Si2O7)(Si2O6OH) C1 1
56.02.04.17 Kochite ! Na2(Na,Ca)4Ca4(Mn,Ca)2Zr2Ti2(Si2O7)4(O,F)4F4 P1 1
56.02.04.18 Marianoite ! Na2Ca4(Nb,Zr)2(Si2O7)2(O,F)4 P 21 2/m
Strunz Class:
09.HF.05 09 - SILICATES (Germanates)
09.H - Unclassified Silicates
09.HF -With Nb, Ta, Zr
09.HF.05 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)
See Also:
Links to other databases for Mongolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
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Mongolite
Ca4Nb6Si5O24(OH)10•5(H2O)
Dana No: 56.02.04.15 Strunz No: 09.HF.05
Locality:
Notes:
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