Figure 1. Holotype material of manganiakasakaite-(La). It occurs as a subhedral grain hosted in pyroxmangite. Field of view: 1.5 × 2 mm. Collection Museo di Storia Naturale, University of Pisa (catalogue number 19907). — Photo: Biagioni, C.; Bonazzi, P.; Pasero, M.; Zaccarini, F.; Balestra, C.; Bracco, R.; Ciriotti, M.E. · CC BY 4.0
Manganiakasakaite-(La)
Manganiakasakaite-(La) is an IMA-recognized mineral species in the silicate class, with the chemical formula CaLa(Mn³⁺AlMn²⁺)(Si₂O₇)(SiO₄)O(OH).
It crystallizes in the monoclinic crystal system (space group P2_1/m). It is a member of the Epidote structural group.
Key properties: Mohs hardness 5.5–6; specific gravity 4.09; Brown streak; Vitreous luster.
IMA symbol Mnak-La, IMA status: approved, named in 2017.
Found in a manganese deposit in metasedimentary rocks.
It is found associated with Pyroxmangite.
A prefix identifies the dominant cation at the M(1) site (other than Al).