Eosphorite
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Eosphorite is a brown manganese hydrous phosphate mineral with chemical formula: MnAl(OH)₂·H₂O. It is used as a gemstone.
Eosphorite crystallizes in the monoclinic crystal system. It forms slender prismatic crystals which often form radiating or... Wikipedia
Cleavage: Poor on
Color: usually pale brown, golden brown, also medium brown to dark brown; occasionally pink, rose red
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal habit: Prismatic in radiating sprays or spheres, massive; twinned pseudo-orthorhombic
Crystal system: Orthorhombic
Formula (repeating unit): MnAl(PO4)(OH)2·H2O
IMA symbol: Eos