Mongolite
A valid IMA mineral species
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About Mongolite
Formula:
Ca4Nb6Si5O24(OH)10 · nH2O
Colour:
Pale lilac or grayish lilac
Lustre:
Silky
Hardness:
2
Specific Gravity:
3.147
Crystal System:
Tetragonal
Name:
Named after the country of origin.
This page provides mineralogical data about Mongolite.
Unique Identifiers
Mindat ID:
2756
Long-form identifier:
mindat:1:1:2756:0
GUID
(UUID V4):
(UUID V4):
16c0db2a-5f46-415c-87ec-46a30e8540f0
IMA Classification of Mongolite
Approved
IMA Formula:
Ca4Nb6Si5O24(OH)10 · 6H2O
First published:
1985
Classification of Mongolite
9.HF.05
9 : SILICATES (Germanates)
H : Unclassified silicates
F : With Nb, Ta, Zr
9 : SILICATES (Germanates)
H : Unclassified silicates
F : With Nb, Ta, Zr
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
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
17.8.5
17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
17 : Silicates Containing other Anions
8 : Silicates with niobate or tantalate
Mineral Symbols
As of 2021 there are now IMAâCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mgl | IMAâCNMNC | Warr, L.N. (2021). IMAâCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Mongolite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Mongolite
Silky
Transparency:
Translucent
Colour:
Pale lilac or grayish lilac
Hardness:
2 on Mohs scale
Cleavage:
Distinct/Good
One direction, good
One direction, good
Density:
3.147 g/cm3 (Measured) 3.53 g/cm3 (Calculated)
Optical Data of Mongolite
Type:
Uniaxial (-)
RI values:
nω = 1.800 nε = 1.740
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Chemistry of Mongolite
Mindat Formula:
Ca4Nb6Si5O24(OH)10 · nH2O
Common Impurities:
Ti,Al,Mn,Zn,Mg,Sr,Ba,Na,K
Crystallography of Mongolite
Crystal System:
Tetragonal
Cell Parameters:
a = 7.00(5) Å, c = 29.0(1) Å
Ratio:
a:c = 1 : 4.143
Unit Cell V:
1,421.00 Ă
Âł (Calculated from Unit Cell)
Z:
2
Comment:
Point Group: n.d.; Space Group: n.d.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.163 Ă | (100) |
| 2.974 Ă | (70) |
| 3.087 Ă | (65) |
| 9.67 Ă | (45) |
| 5.82 Ă | (45) |
| 2.664 Ă | (40) |
| 2.901 Ă | (35) |
Comments:
Dorozhnyi pegmatite, Mongolia. Data from type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] |
Type Occurrence of Mongolite
General Appearance of Type Material:
Mica-like aggregate of fine scales.
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.
Geological Setting of Type Material:
A late alteration product of an unknown niobium silicate, in the quartz-rich core zone of an alkalic pegmatite.
Associated Minerals at Type Locality:
Reference:
Vladykin, N.V., V.A. Drits, V.I. Kovalenko, M.D. Dorfman, V.S. Malov, and A.I. Gorshkov (1985) A new silicate of niobium, mongolite Ca4Nb6[Si5O20]O4(OH10) ÂČnH2O: Zap. Vses. Mineral. Obshch., 114, 374{377 (in Russian).
Synonyms of Mongolite
Other Language Names for Mongolite
Common Associates
Associated Minerals Based on Photo Data:
| 7 photos of Mongolite associated with Quartz | SiO2 |
| 5 photos of Mongolite associated with Kovalenkoite | (K,Sr,Ba)2Ca5Nb12[Si8O52(O,OH)] · 15H2O |
| 1 photo of Mongolite associated with Arfvedsonite | [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2 |
Related Minerals - Strunz-mindat Grouping
| 9.HF.10 | Loudounite | NaCa5Zr4Si16O40(OH)11 · 8H2O |
Other Information
Thermal Behaviour:
The DTA curve shows a broad endothermic effect between 100 and 350°C, (loss of water), and an exothermic effect at 700°C. The mineral does not melt below 1100°C.
Notes:
The mineral is insoluble in acid except HF.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Mongolite
mindat.org URL:
https://www.mindat.org/min-2756.html
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References for Mongolite
Reference List:
Localities for Mongolite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Mongolia | |
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Russia | |
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Dorozhnyi pegmatite, Khan Bogd Peralkaline Granite, Khanbogd District, Ămnögovi Province, Mongolia