Formula: Fe³⁺₆(PO₄)₄O(OH)₄ · 6H₂O

Species:

Colour: Dark red, reddish, brown-red

Lustre: Resinous, Pearly

Hardness: 3 – 4

Specific Gravity: 2.8 – 3.08

Crystal System: Monoclinic

Member of: Beraunite Group

Name: Named by August Breithaupt in 1840 for the town of Beroun (Beraun) near the type locality at the Hrbek Mine, Svatá Dobrotivá (St Benigna), Beroun (Beraun), Bohemia, Czech Republic.

Type Locality: Hrbek Mine, Svatá Dobrotivá (St Benigna), Zaječov, Beroun District, Central Bohemian Region – Czech Republic

A secondary mineral found in bog iron ores and phosphate deposits, plus as a cement in clays, sands, and bone material; also as an alteration product of triphylite in granitic pegmatites. The name beraunite is now applied only to the fully oxidised species (  and the name ferroberaunite should be applied to the mixed-valence phase. Beraunite is always reddish, while ferrobraunite is greenish. May be confused with acicular dufrénite and natrodufrénite.