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Mengxianminite

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About MengxianminiteHide

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
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.



Classification of MengxianminiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of MengxianminiteHide

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

Type:
Biaxial (-)
RI values:
nα = 1.800(2) nβ = 1.830(2) nγ = 1.840(2)
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of MengxianminiteHide

Formula:
(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2
IMA Formula:
Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2

Crystallography of MengxianminiteHide

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

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

Type Occurrence of MengxianminiteHide

General Appearance of Type Material:
Subhedral to euhedral green crystals from 20 to 200 μm long in the hsianghualite vein of the Xianghualing skarn
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,Na0.392.03(Sn1.85,Zn0.242.09(Mg1.75, Fe0.72,Al0.42,Mn0.19,Ti0.013.09Al8[(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:
Reference:
Rao, C., Hatert, F., Dal Bo, F., Wang, R., Gu, X., Baijot, M. (2017): Mengxianminite, ideally Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2, a new borate mineral from Xianghualing skarn, Hunan Province, China. American Mineralogist: 102: 2136-2141.

Synonyms of MengxianminiteHide

Fluorescence of MengxianminiteHide

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

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MengxianminiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rao, C., Hatert, F., Dal Bo, F., Wang, R., Gu, X., Baijot, M. (2016) Mengxianminite, IMA 2015-070. CNMNC Newsletter No. 29, February 2016, 200. Mineralogical Magazine: 80: 199–205.
Rao, C., Hatert, F., Dal Bo, F., Wang, R., Gu, X., Baijot, M. (2017): Mengxianminite, ideally Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2, a new borate mineral from Xianghualing skarn, Hunan Province, China. American Mineralogist: 102: 2136-2141.

Internet Links for MengxianminiteHide

Localities for MengxianminiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China (TL)
 
  • Hunan Province
    • Chenzhou Prefecture
      • Linwu Co.
Rao, C., Hatert, F., Dal Bo, F., Wang, R., Gu, X., Baijot, M. (2016) Mengxianminite, IMA 2015-070. CNMNC Newsletter No. 29, February 2016, 200. Mineralogical Magazine: 80: 199–205.
Mineral and/or Locality  
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