Cyrilovite

minerals

dufrenite

frondelite

phosphosiderite

Images
Formula:NaFe3+3(PO4)2(OH)4.2H2O
Hydrated phosphate containing hydroxyl, wardite group
Specific gravity: 3.081 to 3.096
Hardness: 4
Streak: Yellow
Colour: Bright yellow, honey-yellow, orange to brownish yellow, brown
Environments

Pegmatites

Cyrilovite is a rare accessory mineral in some oxidising phosphate-bearing granite pegmatites and iron deposits (HOM).
Associated minerals include dufrénite, frondelite, phosphosiderite, leucophosphite, whitlockite, kingsmountite, triphylite, rockbridgeite, strengite, jahnsite, montgomeryite, millisite, wardite, apatite and wavellite (HOM).

At the Mount Deverell variscite deposit, Milgun Station, Western Australia, cyrilovite has been found as crusts on fracture surfaces in siltstone, associated with mitridatite and leucophosphite. The variscite deposits are hosted by marine sedimentary rocks (AJM 20.2.24).

At the type locality, the Cyrilov phosphate pegmatite, Křižanov, Žďár nad Sázavou District, Vysočina Region, Czech Republic, cyrilovite occurs in a pegmatite (Mindat).

Back to Minerals