Black sharp crystal of marokite from Morocco (Tachgagalt Mine, Ouarzazate Province, Drâa-Tafilalet Region, Morocco) in matrix. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Marokite
Marokite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaMn³⁺₂O₄.
It crystallizes in the orthorhombic crystal system (space group Pbcm). It is a member of the Post-spinel structural group.
Key properties: Mohs hardness 6.5; specific gravity 4.64; Reddish brown streak; Adamantine luster; optically biaxial.
IMA symbol Mro, IMA status: approved, named in 1963.
Found in hydrothermal manganese oxide deposits.
It is found associated with Jouravskite, hausmannite, braunite, cryptomelane, pyrolusite, crednerite, dolomite, barite, calcite (Tachgagalt, Morocco); pyrolusite, cryptomelane.
The name refers to the first occurrence in Morocco, Maroc in French.