Mengxianminite (original) (raw)
A valid IMA mineral species
About MengxianminiteHide
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Formula:
(Ca,Na)2Sn2(Mg,Fe)3Al8[(BO3)(BeO4)O6]2
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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Long-form identifier:
mindat:1:1:47016:2
1b1121d2-8dde-435d-a81b-243986beb19d
IMA Classification of MengxianminiteHide
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IMA Formula:
Ca2Sn2Mg3Al8[(BO3)(BeO4)O6]2
Type description reference:
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.
| Symbol | Source | Reference |
|---|---|---|
| Mgx | IMA–CNMNC | Warr, 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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Transparency:
Transparent, Translucent
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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RI values:
_n_α = 1.800(2) _n_β = 1.830(2) _n_γ = 1.840(2)
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
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
Crystallography of MengxianminiteHide
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Crystal System:
Orthorhombic
Class (H-M):
m _m_2 - Pyramidal
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
Morphology:
Subhedral to euhedral green crystals from 20 to 200 μm long.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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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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:
| Al2O3 | 40.00 % |
|---|---|
| SnO2 | 25.96 % |
| MgO | 6.57 % |
| CaO | 8.56 % |
| FeO | 4.83 % |
| B2O3 | 6.53 % |
| BeO | 4.37 % |
| ZnO | 1.81 % |
| MnO | 1.23 % |
| Na2O | 1.13 % |
| TiO2 | 0.10 % |
| SiO2 | 0.04 % |
| 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
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Related Minerals - Strunz-mindat GroupingHide
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| 6.AB. | Chubarovite | KZn2(BO3)Cl2 | Trig. 32 : _R_32 |
|---|---|---|---|
| 6.AB. | Rhabdoborite-(Mo) | Mg12Mo6+1.33O6(BO3)6F2 | Hex. 6 : _P_63 |
| 6.AB.05 | Hambergite | Be2(BO3)(OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c a |
| 6.AB.10 | Berborite | Be2(BO3)(OH,F) · H2O | Trig. |
| 6.AB.15 | Jeremejevite | Al6(BO3)5(F,OH)3 | Hex. 6/m : _P_63/m |
| 6.AB.20 | Yuanfuliite | Mg(Fe3+,Al)O(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 6.AB.20 | Warwickite | (Mg,Ti,Fe,Al)2O(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 6.AB.25 | Karlite | (Mg,Al)6.5(BO3)3(OH)4(◻,Cl)0.5 | Orth. 222 : _P_21212 |
| 6.AB.30 | Marinaite | Cu2Fe3+O2(BO3) | Mon. 2/m : _P_21/b |
| 6.AB.30 | Savelievaite | Mg2Cr3+O2(BO3) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Fredrikssonite | Mg2(Mn3+,Fe3+)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Vonsenite | Fe2+2Fe3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Ludwigite | Mg2Fe3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Azoproite | (Mg,Fe2+)2(Fe3+,Ti,Mg)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.30 | Bonaccordite | Ni2Fe3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P b a m |
| 6.AB.35 | Folvikite | Sb5+Mn3+(Mg,Mn2+)10O8(BO3)4 | Mon. 2 : _P_2 |
| 6.AB.35 | Pinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Mon. 2/m : _B_2/m |
| 6.AB.40 | Takéuchiite | (Mg,Mn2+)2(Mn3+,Fe3+)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 6.AB.40 | Blatterite | Sb5+3(Mn3+,Fe3+)9(Mn2+,Mg)35(BO3)16O32 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 6.AB.40 | Orthopinakiolite | (Mg,Mn2+)2Mn3+(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) : P n n m |
| 6.AB.40 | Chestermanite | Mg2(Fe3+,Mn3+,Al,Sb3+)(BO3)O2 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 6.AB.45 | Aluminomagnesiohulsite | (Mg,Fe2+)2(Al,Mg,Sn)(BO3)O2 | Mon. 2/m : _P_2/m |
| 6.AB.45 | Hulsite | (Fe2+,Mg)2(Fe3+,Sn)(BO3)O2 | Mon. 2/m : _P_2/m |
| 6.AB.45 | Magnesiohulsite | (Mg,Fe2+)2(Fe3+,Sn,Mg)(BO3)O2 | Mon. 2/m : _P_2/m |
| 6.AB.50 | Fluoborite | Mg3(BO3)(F,OH)3 | Hex. 6/m : _P_63/m |
| 6.AB.50 | Hydroxylborite | Mg3(BO3)(OH)3 | Hex. 6/m : _P_63/m |
| 6.AB.55 | Shabynite | Mg5(BO3)(OH)5(Cl,OH)2 · 4H2O | Mon. |
| 6.AB.55 | Wightmanite | Mg5(BO3)O(OH)5 · 2H2O | Mon. 2/m |
| 6.AB.60 | Gaudefroyite | Ca4Mn3+2-3(BO3)3(CO3)(O,OH)3 | Hex. |
| 6.AB.65 | Sakhaite | Ca48Mg16(BO3)32(CO3)16 · 2(H2O,HCl) | Iso. m_3_m _(_4/_m_32/m ) : F d_3_m |
| 6.AB.70 | Harkerite | Ca48Mg16[AlSi4O15(OH)]4(BO3)16(CO3)16 · 2(H2O,HCl) | Trig. 3_m_ _(_32/m ) : R_3_m |
| 6.AB.75 | Pertsevite-(F) | Mg2(BO3)(F,OH) | Orth. m _m_2 : P n _a_21 |
| 6.AB.75 | Pertsevite-(OH) | Mg2(BO3)(OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a |
| 6.AB.80 | Jacquesdietrichite | Cu2(H2BO3)(OH)3 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m n a |
| 6.AB.85 | Rhabdoborite-(V) | Mg12(V5+,Mo6+,W6+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} (x < 1) | Hex. 6 : _P_63 |
| 6.AB.85 | Rhabdoborite-(W) | Mg12(W6+,V5+)1.5O6{[BO3]6-x[(P,As)O4]xF2-x} | Hex. 6 : _P_63 |
| 6.AB.85 | Painite | CaZrAl9(BO3)O15 | Hex. 6/m : _P_63/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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References for MengxianminiteHide
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Reference List:
Localities for MengxianminiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
| China (TL) | |
|---|---|
| Hunan Chenzhou Linwu Co. ⓘ Xianghualing Sn-polymetallic ore field (TL) | Hålenius et al. (2016) +1 other reference |