Mongolite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
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
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Mongolite
Reference List:
Localities for Mongolite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Mongolia | |
| |
| |
Russia | |
| |
| |
|
Quick NavTopAbout MongoliteUnique IdentifiersIMA Classification Classification Mineral SymbolsPronunciation Physical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Dorozhnyi pegmatite, Khan Bogd Peralkaline Granite, Khanbogd District, Ămnögovi Province, Mongolia