Lumsdenite
Lumsdenite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NaCa₃Mg₂(As³⁺V⁴⁺₂V⁵⁺₁₀As⁵⁺₆O₅₁)·45H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 2; specific gravity 2.35; Green-blue streak; Vitreous luster; optically biaxial.
IMA symbol Lum, IMA status: approved, named in 2018.
Post-mining, secondary on asphaltum in association with montroseite- and corvusite- bearing sandstone. Deposited where U6+- and V4+/V5+-bearing solutions encountered local.
It is found associated with Gypsum, huemulite, rosslerite.
The name refers to the location of the Packrat mine at the head of Lumsden Canyon.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more L minerals or help write this entry.