•NaFe3+
3 (PO4 )2 (OH)4 2H2 O

Cyrilovite

c 2001-2005 Mineral Data Publishing, version 1

Crystal Data: Tetragonal. Point Group: 422. Thick tabular euhedral crystals, showing{001}, {012}, {113}, to 0.7 mm, in radiating to botryoidal aggregates and crusts.
Physical Properties:D(calc.) = 3.114

Tenacity: Conchoidal. Hardness = n.d. D(meas.) = 3.081–3.096

Optical Properties: Translucent. Color: Bright yellow, honey-yellow, orange to brownish
yellow, brown. Streak: Yellow. Luster: Vitreous.
Optical Class: Uniaxial (–). Absorption: O = deep yellow to yellow; E = colorless to yellow.
ω = 1.802–1.805  = 1.769–1.775
Cell Data:

Space Group: P 41 21 2 or P 43 21 2.

a = 7.313(2)c = 19.315(3)Z=4X-ray Powder Pattern: Cyrilov pegmatite, Czech Republic.
4.85 (10), 3.186 (8), 2.664 (8), 3.101 (5), 3.60 (4), 2.020 (4), 1.553 (4)Chemistry:
P2 O5
Al2 O3Fe2 O3
FeO
MnO
MgO

(1)
29.06
1.36
47.87
0.00
0.99(2)
31.77
0.00
47.19
0.00
0.00

(3)
29.29
49.44

CaONa2 OK2 O
H2 O
insol.

(1)
0.10
4.70
0.63
14.45
1.04

(2)
0.80
6.28
0.00
14.95

(3)
6.40
14.87

Total 100.20
100.99100.003+(1) Sapucaia mine, Brazil; corresponds to (Na0.74 Mn0.07 K0.06 Ca0.01 )Σ=0.88 (Fe2.93 Al0.13 )Σ=3.06(PO4 )2 (OH)3.84 • 2H2 O. (2) Near Torre Argentina, Sardinia, Italy; by electron microprobe,•H2 O by TGA; corresponds to (Na0.92 Ca0.06 )Σ=0.98 Fe3+
2.98 (PO4 )2.03 (OH)4.00 2.00H2 O.
(3) NaFe3 (PO4 )2 (OH)4 • 2H2 O.
Occurrence: A rare accessory mineral in some oxidizing phosphate-bearing granite pegmatites
and iron deposits.
Association: Dufrénite, frondelite, phosphosiderite, leucophosphite, whitlockite, kingsmountite,triphylite, rockbridgeite, strengite, phosphosiderite, jahnsite, montgomeryite, millisite, wardite,apatite, wavellite.
Distribution: From the Cyrilov pegmatite, Velké Meźiřiči, Czech Republic. In the Gunheathchina clay pit, St. Austell, Cornwall, England. At Rochefort-en-Terre, Bretagne, France. InPortugal, from the Vermilhas pegmatite, Vouzela; the Mangualde pegmatite, near Mesquitela; andthe Bendada pegmatite, near Guarda. At Hagendorf, Bavaria, Germany. Between Torre Argentina
and Punta Capuzzo, Bosa region, Sardinia, Italy. In the Kabingo pegmatites, Rwanda. From
Kokpatas and Djargantan, central Kyzylkum region, Uzbekistan. At the Sapucaia pegmatite
mine, about 50 km east-southeast of Governador Valadares, and in the Énio pegmatite mine,
northeast of Galiléia, Minas Gerais, Brazil. In Australia, on Milgun Station, Western Australia; inthe Iron Monarch quarry, Iron Knob, at the Moculta phosphate quarry, northeast of Angaston,and in the Fairview quarry, near Robertstown, South Australia; at Wycheproof, and in the Lake
Boga granite quarry, near Swan Hill, Victoria. In the USA, from the Palermo #1 mine, near
North Groton, Grafton Co., New Hampshire, and in the Tip Top mine, 8.5 km southwest ofCuster, Custer Co., South Dakota.
Name:

For its occurrence in the Cyrilov pegmatite, Czech Republic.

Type Material:

National Museum of Natural History, Washington, D.C., USA, 107425.

References: (1) Novotný, M. and J. Staněk (1953) Nový minerál fosforečnan cyrilovit. ActaAcad. Sci. Nat. Moravo-Silesacae, 25(11), 325–336 (in Czech with English abs.). (2) (1955)
Mineral. Abs., 12, 512–513 (abs. ref. 1). (3) Lindberg, M.L. (1957) Relationship of the minerals
avelinoite, cyrilovite, and wardite. Amer. Mineral., 42, 204–213. (4) (1957) Amer. Mineral., 42,586 [avelinoite = cyrilovite]. (5) Cozzupoli, D., O. Grubessi, A. Mottana, and P.F. Zanazzi (1987)
Cyrilovite from Italy; structure and crystal chemistry. Mineral. Petrol., 37, 1–14.
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