ISSN

print 2570-7337
online 2570-7345

Burgessit, nový minerál pro jáchymovský rudní revír (Česká republika)

Burgessite, a new mineral for the Jáchymov ore district (Czech Republic)


Klíčová slova

Abstrakt

Very rare mineral specie, burgessite Co2(H2O)4[AsO3(OH)]2(H2O), was identified at single historical sample from the Jáchymov ore district, Krušné hory Mountains, Czech Republic. Burgessite occurs as light to purplish red hemisperical aggregates up to 0.8 mm in size formed by elongated prismatic crystals (length to 0.4 mm and diameter of about 10 - 30 μm only). Tiny green thin tabular zeunerite crystals and purple red crusts of amorphous Co-Ni-Cu hydrogen-arsenate phase were found in the association. Burgessite is monoclinic, space group P21/n, the unit-cell parameters refined from the X-ray powder diffraction data are: a 4.672(1), b 9.281(2), c 12.606(3) Å, β 99.11(2)° and V 539.8(2) Å3. The average chemical composition (mean of 8 point analyses) of burgessite CaO 0.10, FeO 0.29, MgO 0.14, CuO 1.51, CoO 16.03, NiO 13.32, ZnO 0.63, As2O5 47.63, P2O5 0.21, SO3 0.72, H2Ocalc. 22.96, total 103.54 wt. % corresponds to the empirical formula (Co1.00Ni0.84Cu0.09Zn0.04Mg0.02Fe0.02Ca0.01)Σ2.02 (AsO3OH)1.94(SO4)0.04(PO3OH)0.01.5H2O on the basis of (As+S+P) = 2 apfu. The occurrence of Ni-rich burgessite at the Jáchymov ore district is the second locality of this mineral phase worldwide.

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