Outstanding rose red specimen of the extremely rare K-Mn sulphate mineral manganolangbeinite from the type and only known locality worldwide in Mount Vesuvius (Campania, Italy). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Manganolangbeinite
The manganese member of the langbeinite family — a potassium-manganese sulfate with the langbeinite structure.
Intro adapted from Wikipedia (CC BY-SA).
Manganolangbeinite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₂Mn²⁺₂(SO₄)₃.
It crystallizes in the cubic crystal system (space group P2_13). It is a member of the Langbeinite structural group.
IMA symbol Mlgb, grandfathered status — known before the IMA’s founding, named in 1924.
Found in a cavern in lava, in thenardite and halite stalactites, formed by fumarolic action.
It is found associated with Thenardite, halite, sylvite, aphthitalite.
As a manganese compound analogous to langbeinite.