ISSN
print 2570-7337
online 2570-7345
An occuurence of Mn-rich köttigite at the area of Marie and Geyer veins, Svornost, Jáchymov (Czech Republic)
Keywords
Abstract
An unusual occurrence of two types of Mn-rich köttigite was found at the area of Marie and Geyer veins, Daniel level of Svornost mine, the Jáchymov ore district (Czech Republic). Köttigite I occurs as rich light pink crystalline coatings formed by very brittle aggregates up to 1 - 2 mm in size. It is monoclinic, space group C2/m, the unit-cell parameters refined from the X-ray powder diffraction data are: a 10.283(1), b 13.448(1), c 4.7761(6) Å, β 105.18(1)° and V 637.4(1) Å3. Its chemical composition (mean of 6 point analyses) corresponds to the empirical formula (Zn1.86Mn0.44Mg0.31Co0.15Ni0.12Ca0.10)Σ2.98 (AsO4)1.98(PO4)0.02.8H2O on the basis of (As+P) = 2 apfu. Köttigite II forms dark red-violet to crimson aggregates and groups of well-formed tabular crystals up to 2 mm in size. Its unit-cell parameters refined from the X-ray powder diffraction data are: a 10.272(2), b 13.451(1), c 4.773(1) Å, β 105.18(1)° and V 636.4(2) Å3; its chemical composition (mean of 9 point analyses) can be expressed on the basis of (As+P) = 2 apfu as (Zn1.46Mn0.49Co0.34Mg0.29Ni0.24Ca0.07)Σ2.89 (AsO4)1.99(PO4)0.01.8H2O.
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References
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