Schulenbergite(Cu, Zn)7(SO4 )2 (OH)10 • 3H2 O
c 2001-2005 Mineral Data Publishing, version 1

Crystal Data: Hexagonal. Point Group: 3 or 3. Crystals are hexagonal or rhombic, verythin tabular, to 4 mm, in spherules, sheaves, and rosettes.
Physical Properties:
Cleavage: Perfect on {0001}; poor on {1120}. Hardness = ∼2D(meas.) = 3.28–3.42 D(calc.) = 3.38–3.45
Optical Properties: Transparent. Color: Pale blue-green, emerald-green. Streak: Blue-green,pale green. Luster: Vitreous, pearly on {0001}.
Optical Class: Uniaxial (–). Pleochroism: Faint to strong; O = colorless, emerald-green togreen; E = colorless to pale green. ω = 1.640–1.707  = 1.623–1.666
Cell Data:

Space Group: P 3 or P 3.

a = 8.211–8.249

c = 7.106–7.183

Z=1

X-ray Powder Pattern: [Glücksrad mine,] Germany.
7.186 (100), 2.700 (80), 2.527 (80), 3.581 (40), 3.209 (30), 2.157 (30), 1.559 (30)
Chemistry:
SO3
CO2
CoO
NiO

(1)
17.4
0.8(2)
15.13
0.84
0.78

CuOZnO
H2 O

(1)
36.7
28.1
17.4(2)53.1811.39[18.68]

Total 100.4[100.00](1) [Glücksrad mine,] Germany; CO2 by gas chromatograph, H2 O by TGA; corresponds to(Cu4.00 Zn3.00 )Σ=7.00 [(SO4 )1.89 (CO3 )0.16 )]Σ=2.05 (OH)9.90 • 3.43H2 O. (2) Cap Garonne mine, France;by electron microprobe, average of nine analyses, H2 O by difference; corresponds to (Cu5.77 Zn1.21
Ni0.10 Co0.09 )Σ=7.17 (SO4 )1.63 (OH)11.08 • 3.40H2 O.
Occurrence: A rare secondary mineral formed in the oxidized zone of Cu–Zn-bearinghydrothermal mineral deposits, commonly post-mine; in Cu–Zn slags.
Association: Namuwite, brochantite, posnjakite, ktenasite, serpierite, linarite, malachite,cerussite, hemimorphite, smithsonite, gypsum, chalcopyrite, sphalerite, quartz.
Distribution: In Germany, in the Harz Mountains, from dumps at the Glücksrad mine, near
Oberschulenberg, and in slag at the Ochsenhütte, Granetal, and at Juliushütte, Astfeld, near
Goslar; from the Marie mine, southeast of Wilnsdorf, near Siegen, and in the Wilder Mann mine,near Müsen, Siegerland; from the Bastenberg mine, near Ramsbeck, North Rhine-Westphalia; inthe Richelsdorfer Mountains, Hesse; on dumps of the Friedrichssegen mine, near Bad Ems, atthe Virneberg mine, near Rheinbreitbach, Rhineland-Palatinate, and elsewhere. From the Cap
Garonne mine, near le Pradet, Var, France. In England, from the Smallcleugh mine, Nenthead,Cumbria; large crystals in the Waterbank mine, Ecton Hill, Staffordshire, at the Prince of Walesmine, Calstock, and in the Penberthy Croft mine, St. Hilary, Cornwall. In Wales, from theDyfngwm mine, Penegoes, Powis; in Dyfed, at the Penrhiw mine, Ystumtuen, from the Ystrad
Einion mine, at the Nantycagl (Eaglebrook) mine, Ceulanymaesmawr, and in the Frongoch mine.
From the Kamariza mine, and in slag, at Laurium, Greece. At Broken Hill, New South Wales,Australia.
Name:For its occurrence at the Glücksrad mine, near Oberschulenberg, Germany.

Type Material: Institute of Crystallography and Petrography, University of Hannover,Hannover, Germany; National School of Mines, Paris, France.
References: (1) Hodenberg, R.v., W. Krause, and H. Täuber (1984) Schulenbergit, (Cu, Zn)7(SO4 , CO3 )2 (OH)10 • 3H2 O, ein neues Mineral. Neues Jahrb. Mineral., Monatsh., 17–24 (inGerman with English abs.). (2) (1985) Amer. Mineral., 70, 438 (abs. ref. 1). (3) Mumme, W.G.,
H. Sarp, and P.J. Chiappero (1994) A note on the crystal structure of schulenbergite. Archs Sci.
Genève, 47(2), 117–124.
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