Sphalerite(Zn, Fe)Sc 2001-2005 Mineral Data Publishing, version 1

Crystal Data: Cubic. Point Group: 43m. Crystals tetrahedral, dodecahedral, typicallycomplex and distorted, curved and conical faces common, to 30 cm. Also fibrous, botryoidal,stalactitic, cleavable, coarse to fine granular, massive. Twinning: Twin axis [111], twin plane{111}, simple contact twins or complex lamellar forms.
Physical Properties:
Cleavage: Perfect on {011}. Fracture: Conchoidal. Tenacity: Brittle.
Hardness = 3.5–4 VHN = 208–224 (100 g load). D(meas.) = 3.9–4.1 D(calc.) = 4.096
Pyroelectric, may be triboluminescent, fluorescent.
Optical Properties: Transparent to translucent, opaque when iron-rich. Color: Highlyvariable, ranging from colorless to dark brown, gray, black, commonly brown, yellow, red, green.
Streak: Pale brown to pale yellow and white. Luster: Resinous to adamantine.
Optical Class: Isotropic. n = 2.369 (Na) (ZnS). Anisotropism: May show strain-induced
birefringence.
R: (400) 19.6, (420) 19.0, (440) 18.3, (460) 17.9, (480) 17.5, (500) 17.2, (520) 16.9, (540) 16.7,(560) 16.5, (580) 16.4, (600) 16.3, (620) 16.2, (640) 16.1, (660) 16.0, (680) 15.9, (700) 15.8
Cell Data:

Space Group: F 43m. a = 5.4060

Z=4

X-ray Powder Pattern: Synthetic ZnS.
3.123 (100), 1.912 (51), 1.561 (30), 2.705 (10), 1.240 (9), 1.1034 (9), 1.351 (6)Chemistry:
Zn
Fe
Cd

(1)
66.98
0.15

(2)
44.67
18.25
0.28

(3)
67.10

(1)
MnS

32.78

(2)
2.66
33.57

(3)
32.90

Total 99.91
99.43
100.00(1) Sonora, Mexico; corresponds to Zn1.00 S1.00 . (2) St. Christoph mine, Isère, France; corresponds
to (Zn0.65 Fe0.31 Mn0.05 )Σ=1.01 S1.00 . (3) ZnS.
Polymorphism & Series:
Mineral Group:

Trimorphous with matraite and wurtzite.

Sphalerite group.

Occurrence: Formed under a wide range of low- to high-temperature hydrothermal conditions;in coal, limestone, and other sedimentary deposits.
Association: Galena, chalcopyrite, marcasite, pyrite, fluorite, barite, quartz, many otherhydrothermal minerals.
Distribution: The most important ore of zinc. Only a few localities for the finest crystallized
examples can be given. In Germany, from Freiberg, Saxony, and Neudorf, Harz Mountains.
Colorless crystals in the Lengenbach quarry, Binntal, Valais, Switzerland. At Hornı́ Slavkov(Schlaggenwald) and Přı́bram, Czech Republic. From Rodna, Romania. Transparent crystals inthe Aliva mine, Picos de Europa Mountains, Cantabria [Santander] Province, Spain. In England,from Alston Moor, Cumbria. At Dal’negorsk, Primorskiy Kray, Russia. From Watson Lake, YukonTerritory, Canada. In the USA, in the Tri-State district of the Mississippi Valley; near Baxter
Springs, Cherokee Co., Kansas; Joplin, Jasper Co., Missouri and Picher, Ottawa Co., Oklahoma.
From the Elmwood mine, near Carthage, Smith Co., Tennessee; in the Eagle mine, Gilman
district, Eagle Co., Colorado. In Mexico, from Santa Eulalia and Naica, Chihuahua, and Cananea,Sonora. At Huaron, Casapalca, and Huancavelica, Peru.
Name: From the Greek for treacherous, the mineral sometimes being mistaken for galena, but
yielding no lead.
References: (1) Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy,(7th edition), v. I, 210–215. (??) Ewald, ?? (1916) ??title?? Ann. Phys.,??, 257–??. str?? or(1980) Acta Cryst., A36, 482 ?? (2) (1953) NBS Circ. 539, 2, 16. (3) Criddle, A.J. and C.J.
Stanley, Eds. (1993) Quantitative data file for ore minerals, 3rd ed. Chapman & Hall, London,523.
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