Mengxianminite
Mengxianminite is an IMA-recognized mineral species in the borate class, with the chemical formula Ca₂Sn₂Mg₃Al₈[(BO₃)(BeO₄)O₆]₂.
It crystallizes in the orthorhombic crystal system (space group Fdd2).
Key properties: Mohs hardness 8; specific gravity 4.17; Vitreous luster; optically biaxial.
IMA symbol Mgx, IMA status: approved, named in 2015.
Found in a hsianghualite-bearing vein in the exocontact of a contact metamorphic rock.
It is found associated with Fluorite, phlogopite, hsianghualite, magnetite, dravite, magnesiotaaffeite-2N′2S, calcite.
The mineral was named to honor “Meng Xianmin” (1900-1969), a Chinese geologist, who made significant contributions to our understanding of ore deposits in China.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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