mineral

Purpurite

Manganese Iron Phosphate, Mn3+(PO4)

Hardness: 4 to 4.5 on the Mohs scale; Color: Deep purple, reddish-purple, dark brown, or black; Luster: Sub-metallic to dull or satin; Crystal Structure: Orthorhombic, usually found in massive or granular forms; Cleavage: Good in one direction; Specific Gravity: 3.4 to 3.7

Hardness: 4 to 4
Color: Deep purple, reddish-purple, dark brown, or black
Luster: Sub-metallic to dull or satin

Identified August 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms as a secondary mineral resulting from the alteration and leaching of lithiophilite or triphylite in complex granitic pegmatites. Geological age varies depending on the pegmatite host rock, typically Precambrian to Paleozoic.

Uses & applications

Primarily collected as a mineral specimen for display by enthusiasts due to its striking purple color; occasionally cut into cabochons for unique jewelry.

Geological facts

Purpurite is known for its intense violet color, which is caused by the presence of manganese in the trivalent state (Mn3+). Exposure to strong acids can cause the color to fade or alter.

Field identification & locations

Can be identified in the field by its distinct vibrant purple to reddish-purple coloration and association with other pegmatite phosphate minerals like triphylite. Commonly found in pegmatites in localities such as the Black Hills of South Dakota, USA, as well as in Namibia, Australia, and Sweden.