Schulenbergite Locality: Ramsbeck, Meschede, Sauerland, North Rhine-Westphalia, Germany Field of view 6 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Schulenbergite
Schulenbergite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (Cu,Zn)₇(SO₄)₂(OH)₁₀·3H₂O.
It crystallizes in the hexagonal crystal system (space group P-3). It is a member of the Ktenasite structural group.
Key properties: Mohs hardness 2; specific gravity 3.28–3.42; Blue-green, pale green streak; Vitreous, pearly on {0001} luster; optically uniaxial.
IMA symbol Slb, IMA status: approved, named in 1982.
A rare secondary mineral formed in the oxidized zone of Cu–Zn-bearing hydrothermal mineral deposits, commonly post-mine; in Cu–Zn slags.
It is found associated with Namuwite, brochantite, posnjakite, ktenasite, serpierite, linarite, malachite, cerussite, hemimorphite, smithsonite, gypsum, chalcopyrite, sphalerite, quartz.
The name refers to its occurrence at the Glücksrad mine, near Oberschulenberg, Germany.