Cyrilovite

phosphate

pegmatite

Formula:NaFe3+3(PO4)2(OH)4.2H2O
Hydrated phosphate containing hydroxyl, wardite group
Specific gravity: 3.081 to 3.096
Hardness: 4
Streak: Yekkow
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 type locality, the Cyrilov phosphate pegmatite, Křižanov, Žďár nad Sázavou District, Vysočina Region, Czech Republic, cyrilovite occurs in a pegmatite (Mindat).

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