Manganokukisvumite
Manganokukisvumite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₆MnTi₄Si₈O₂₈·4H₂O.
It crystallizes in the orthorhombic crystal system (space group Pccn).
Key properties: Mohs hardness 5.5–6; specific gravity 2.86; White streak; Vitreous luster; optically biaxial.
IMA symbol Mkki, IMA status: approved, named in 2002.
A late mineral formed by hydrothermal dissolution of titanium-bearing minerals in an albite-rich syenite breccia in an intrusive alkaline complex.
It is found associated with Aegirine, microcline, albite, annite, pyrite, pyrrhotite, natrolite, calcite (Canada); kukisvumite (Russia).
As the manganese-dominant analogue of kukisvumite.
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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