(Fe2+ , Mg)Al2 (PO4 )2 (OH)2Scorzalite

c 2001-2005 Mineral Data Publishing, version 1

Crystal Data:
lamellar.

Monoclinic. Point Group: 2/m.

Massive, to 7 cm. Twinning: Multiple,

Physical Properties:
Cleavage: On {110}, good; on {101}, indistinct. Hardness = 6D(meas.) = 3.33 D(calc.) = 3.32
Optical Properties: Semitransparent. Color: Dark blue. Streak: White to pale blue.
Luster: Vitreous.
Optical Class: Biaxial (–). Pleochroism: X = colorless; Y = Z = blue. Orientation: Y = b;
X ' c. Dispersion: r < v, perceptible. α = 1.626–1.645 β = 1.654–1.674 γ = 1.663–1.680
2V(meas.) = n.d. 2V(calc.) = 58◦ –62◦
Cell Data:

Space Group: P 21 /c. a = 7.15

b = 7.31

c = 7.25

β = 120◦ 350

Z=2X-ray Powder Pattern: Corrego Frio mine, Brazil; nearly identical to lazulite.
3.24 (vs), 3.20 (vs), 3.14 (s), 6.17 (m), 4.72 (m), 3.08 (m), 2.55 (m)
(1)
(2)
(1)
(2)
Chemistry:
(1)
(2)
CaO
0.02
FeO
14.74
11.30
P2 O5
42.90
44.64
H2 O
MnO
0.11
TiO20.10
5.86
5.66
ZnO
0.17
Al2 O3 30.87
32.06
Total 99.54
100.00
MgO
4.23
6.34
Fe2 O30.54
3+(1) Corrego Frio mine, Brazil; corresponds to (Fe2+0.66 Mg0.34 Zn0.01 )Σ=1.01 (Al1.93 Fe0.02 )Σ=1.95(PO4 )1.94 (OH)2.08 . (2) (Fe, Mg)Al2 (PO4 )2 (OH)2 with Fe:Mg = 1:1.
Polymorphism & Series:
Mineral Group:

Forms a series with lazulite.

Lazulite group.

Occurrence: Typically a secondary mineral in complex zoned granite pegmatites; may occur inkyanite-rich quartzite.
Association: Souzalite, triphylite, wyllieite, trolleite, apatite, lacroixite, berlinite, tourmaline,muscovite, feldspar, quartz.
Distribution: From the Corrego Frio pegmatite mine, Divino das Laranjeiras, near Linópolis,Minas Gerais, Brazil. In the USA, at the Victory mine, four km northeast of Custer, Custer
Co., and the White Cap mine, three km south of Keystone, Pennington Co., South Dakota; inthe Palermo #1 mine, near North Groton, Grafton Co., and the G.E. Smith mine, Newport,New Hampshire; at the Champion mine, Mono Co., California; from McIntyre Creek, aboutfour km west of Glendevey, Larimer Co., Colorado. In the Buranga and Rusororo pegmatites,
Gatumba district, Rwanda. At Jebilet, Morocco. From Hålsjöberget, Värmland, and in theNorrö pegmatite, on Rånö Island, Sweden. At Hagendorf, Bavaria, Germany. Other localities arereported, but chemical analyses would be desirable.
Name: To honor Dr. Evaristo Pena Scorza (1899–?), Chief Mineralogist, Mineral Survey ofBrazil, Rio de Janeiro, Brazil.
Type Material: The Natural History Museum, London, England, 1965,207; Harvard University,Cambridge, Massachusetts, 100679; National Museum of Natural History, Washington, D.C., USA,C5862.
References: (1) Palache, C., H. Berman, and C. Frondel (1951) Dana’s system of mineralogy,(7th edition), v. II, 908–911. (2) Pecora, W.T. and J.J. Fahey (1949) The Corrego Frio pegmatite,
Minas Gerais: scorzalite and souzalite, two new phosphate minerals. Amer. Mineral., 34,83–93. (3) Pecora, W.T. and J.J. Fahey (1950) The lazulite-scorzalite isomorphous series.
Amer. Mineral., 35, 1–18. (4) Lindberg, M.L. and C.L. Christ (1959) Crystal structuresof the isostructural minerals lazulite, scorzalite and barbosalite. Acta Cryst., 12, 695–697.
(5) Abernathy, S.A. and F.N. Blanchard (1982) Variations in unit cell parameters and in theX-ray diffraction intensity ratio I(200)/I(100) in the lazulite-scorzalite series. Amer. Mineral., 67,610–614.
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