Small Serrabrancaite crystals in a vug in vernadite (Specimen size: 4.7 cm) Locality: Alto Serra Branca Pegmatite, near Pedra Lavrada, Paraiba, Brazil — Photo: Thomas Witzke · CC BY-SA 3.0 de
Serrabrancaite
A hydrated manganese phosphate named for Brazil's Alto Serra Branca pegmatite mine.
Intro adapted from Wikipedia (CC BY-SA).
Serrabrancaite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Mn(PO₄)·H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Kieserite structural group.
Key properties: Mohs hardness 3.5; specific gravity 3.17; Olive-green streak; Adamantine luster.
IMA symbol Sra, IMA status: approved, named in 1998.
A secondary alteration product of triplite in a granitic pegmatite.
It is found associated with Vernadite, phosphosiderite.
The name refers to the Alto Serra Branca granitic pegmatite, Brazil.