Bulletin Mineralogie Petrologie

Števko Martin, Plecháček Josef, Venclík Viktor, Malíková Radana

Ročník 23, číslo 1 (2015), strana 39-42

hausmannite, manganosite, manganese oxides, chemical composition, Čučma, Gemeric Superunit, Slovak Republic, powder X-ray diffraction data

Hausmannite and manganosite were identified at the Čierna baňa manganese deposit near Čučma, Slovenské rudohorie Mts., Gemeric Superunit, Slovak Republic. Hausmannite occurs as black, fine-grained masses up to 10 cm in size. It contain aggregates of manganosite and microscopic barite, rhodonite, rhodochrosite and spessartine inclusions. The refined unit-cell parameters of hausmannite from the powder X-ray diffraction data (for the tetragonal space group I4₁/amd) are a = 5.786(11), c = 9.411(2) Å with V = 315.1(6) ų. Manganosite forms anhedral, emerald to dark green grains and aggregates up to 2 mm in size embedded in hausmannite matrix. It is first documented occurrence of this species in Slovakia. The refined unit-cell parameters of manganosite from the powder X-ray diffraction data (for the cubic space group Fm3m) are a = 4.445(1) Å with V = 87.801(2) ų. Its chemical composition is close to the end member with the empirical formula (average of 6 point analyses) corresponding to (Mn_0.99Mg_0.01)_Σ1.00O_1.00 on the basis of O = 1.

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