Purpurite is a scarce manganese phosphate mineral (MnPO4). It is a secondary mineral, formed principally by oxidation of lithiophilite, a lithium manganese phosphate. Purpurite has a submetallic luster, a rich lilac-purple color, and a purplish streak. It has a moderate hardness - about 4 to 5 on the Mohs Hardness Scale. It is principally found in a massive state or as microcrystalline crusts.
Purpurite (4.3 cm across) from the Sandamap (Sandamab) Pegmatite (apparently emplaced at ~470 m.y., Early-Middle Ordovician boundary times), Southern Tin Belt, west-central Namibia.