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⇱ Mengxianminite: Mineral information, data and localities.

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Mengxianminite

A valid IMA mineral species
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About MengxianminiteHide

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Formula:
(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2
Colour:
Green
Lustre:
Vitreous
Hardness:
8
Specific Gravity:
4.170 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Meng Xianmin (孟宪民) (2 February 1900, Wujin County, Jiangsu Province, China – 18 February 1969, Beijing, China), a famous geologist in China, who "devoted himself to work on mineral identification and theory of mineralization in deposits of non-ferrous metals and made significant contributions to the research of ore deposits in China."
New structure type. Unique combination of elements. Mengxianminite is the first borate mineral with both Sn and Be, likely crystallized under F-rich conditions at late stages of the Xianghualing skarn. Other Sn-B minerals are nordenskiöldine, tusionite and vistepite. Third Sn-Be mineral after sverigeite and sørensenite.



Unique IdentifiersHide

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Mindat ID:
47016
Long-form identifier:
mindat:1:1:47016:2

Similar NamesHide

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Mengxianminite (of Huang et al.)Valid as an unnamed mineral(Ca,Na)3(Fe,Mn)2Mg2(Sn,Zn)5Al8O29

IMA Classification of MengxianminiteHide

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Approved
IMA Formula:
Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2
Approval year:
2015
First published:
2017

Classification of MengxianminiteHide

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6.AB.90

6 : BORATES
A : Monoborates
B : BO3, with additional anions; 1(D) + OH, etc.

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
MgxIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MengxianminiteHide

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Vitreous
Transparency:
Transparent, Translucent
Colour:
Green
Hardness:
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Perfect
Perfect cleavage on {100} and good cleavage on {010}
Fracture:
Irregular/Uneven
Density:
4.170 g/cm3 (Calculated)

Optical Data of MengxianminiteHide

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Type:
Biaxial (-)
RI values:
nα = 1.80(2) nβ = 1.83(2) nγ = 1.84(2)
Max. Birefringence:
δ = 0.040
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Optical Extinction:
X = a; Y = b; Z = c.

Chemistry of MengxianminiteHide

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Mindat Formula:
(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2
Element Weights:
Element% weight
O39.171 %
Sn22.357 %
Al20.326 %
Ca7.548 %
Mg6.866 %
B2.036 %
Be1.697 %

Calculated from ideal end-member formula.

Crystallography of MengxianminiteHide

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Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Fdd2
Cell Parameters:
a = 60.699(4) Å, b = 9.914(1) Å, c = 5.745(1) Å
Ratio:
a:b:c = 6.123 : 1 : 0.579
Unit Cell V:
3457.4 ų
Z:
8
Morphology:
Subhedral to euhedral green crystals from 20 to 200 μm long.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
3.00 Å(35)
2.931 Å(100)
2.475 Å(29)
2.430 Å(30)
2.375 Å(100)
2.028 Å(52)
1.807 Å(35)
1.530 Å(98)

Geological EnvironmentHide

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Paragenetic Mode(s):

Type Occurrence of MengxianminiteHide

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General Appearance of Type Material:
Subhedral to euhedral green crystals from 20 to 200 μm long in a hsianghualite vein.
Place of Conservation of Type Material:
Cotype material: (1) Geological Museum of China, No. 16, Yangrou Hutong, Xisi, Beijing 100031, P.R. of China, catalogue number M13293; (2) Laboratory of Mineralogy, University of Liège, Belgium, catalogue number 20395.
Empirical Formula of Type Material:
(Ca1.64,Na0.39)Σ2.03(Sn1.85,Zn0.24)Σ2.09(Mg1.75, Fe0.72,Al0.42,Mn0.19,Ti0.01)Σ3.09Al8[(B1.01O3)(Be0.94O4)O6]2
Chemical Analysis of Type Material:
Al2O340.00 %
SnO225.96 %
MgO6.57 %
CaO8.56 %
FeO4.83 %
B2O36.53 %
BeO4.37 %
ZnO1.81 %
MnO1.23 %
Na2O1.13 %
TiO20.10 %
SiO20.04 %
Total:101.13 %
Geological Setting of Type Material:
Xianghualing skarn, Linwu County, Hunan Province, China.
Associated Minerals at Type Locality:

Synonyms of MengxianminiteHide

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Other Language Names for MengxianminiteHide

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Related Minerals - Strunz-mindat GroupingHide

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6.AB.ChubaroviteKZn2(BO3)Cl2Trig. 32 : R32
6.AB.Rhabdoborite-(Mo)Mg12Mo6+1.33O6(BO3)6F2Hex. 6 : P63
6.AB.05HambergiteBe2(BO3)(OH)Orth. mmm(2/m2/m2/m) : Pbca
6.AB.10BerboriteBe2(BO3)(OH,F) · H2OTrig.
6.AB.15JeremejeviteAl6(BO3)5(F,OH)3Hex. 6/m : P63/m
6.AB.20YuanfuliiteMg(Fe3+,Al)O(BO3)Orth. mmm(2/m2/m2/m) : Pnma
6.AB.20Warwickite(Mg,Ti,Fe,Al)2O(BO3)Orth. mmm(2/m2/m2/m) : Pnma
6.AB.25Karlite(Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5Orth. 222 : P21212
6.AB.30MarinaiteCu2Fe3+O2(BO3)Mon. 2/m : P21/b
6.AB.30SavelievaiteMg2Cr3+O2(BO3)Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30FredrikssoniteMg2(Mn3+,Fe3+)(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30VonseniteFe2+2Fe3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30LudwigiteMg2Fe3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30Azoproite(Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.30BonaccorditeNi2Fe3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pbam
6.AB.35FolvikiteSb5+Mn3+(Mg,Mn2+)10O8(BO3)4Mon. 2 : P2
6.AB.35Pinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Mon. 2/m : B2/m
6.AB.40Takéuchiite(Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2Orth. mmm(2/m2/m2/m) : Pnnm
6.AB.40BlatteriteSb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32Orth. mmm(2/m2/m2/m) : Pnnm
6.AB.40Orthopinakiolite(Mg,Mn2+)2Mn3+(BO3)O2Orth. mmm(2/m2/m2/m) : Pnnm
6.AB.40ChestermaniteMg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2Orth. mmm(2/m2/m2/m)
6.AB.45Aluminomagnesiohulsite(Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2Mon. 2/m : P2/m
6.AB.45HulsiteFe2+2Fe3+O2(BO3)Mon. 2/m : P2/m
6.AB.45MagnesiohulsiteMg2Fe3+O2(BO3)Mon. 2/m : P2/m
6.AB.50FluoboriteMg3(BO3)(F,OH)3Hex. 6/m : P63/m
6.AB.50HydroxylboriteMg3(BO3)(OH)3Hex. 6/m : P63/m
6.AB.55ShabyniteMg5(BO3)(OH)5(Cl,OH)2 · 4H2OMon.
6.AB.55WightmaniteMg5(BO3)O(OH)5 · 2H2OMon. 2/m
6.AB.60GaudefroyiteCa4Mn3+2-3(BO3)3(CO3)(O,OH)3Hex.
6.AB.65SakhaiteCa48Mg16(BO3)32(CO3)16 · 2(H2O,HCl)Iso. m3m(4/m32/m) : Fd3m
6.AB.70HarkeriteCa48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl)Trig. 3m(32/m) : R3m
6.AB.75Pertsevite-(F)Mg2(BO3)(F,OH)Orth. mm2 : Pna21
6.AB.75Pertsevite-(OH)Mg2(BO3)(OH)Orth. mmm(2/m2/m2/m) : Pnma
6.AB.80JacquesdietrichiteCu2(H2BO3)(OH)3Orth. mmm(2/m2/m2/m) : Pmna
6.AB.85Rhabdoborite-(V)Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1)Hex. 6 : P63
6.AB.85Rhabdoborite-(W)Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} Hex. 6 : P63
6.AB.85PainiteCaZrAl9(BO3)O15Hex. 6/m : P63/m

Fluorescence of MengxianminiteHide

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Do not fluoresce in long- or short-wave ultraviolet light.

Other InformationHide

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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 MengxianminiteHide

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mindat.org URL:
https://www.mindat.org/min-47016.html
Please feel free to link to this page.

References for MengxianminiteHide

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Localities for MengxianminiteHide

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Showing 1 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
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Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- 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.
China (TL)
  • Hunan
    • Chenzhou
      • Linwu Co.
Hålenius et al. (2016) +1 other reference
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