%0 Journal Article
%T Gahnite from Siedlimowice, Strzegom-Sob¨®tka granitic massif, SW Poland
%A Adam Suszkiewicz
%A Krzysztof £¿obos
%J Mineralogia Polonica
%D 2004
%I 
%X Green spinel was found in a vein pegmatite in Siedlimowice (Strzegom-Sob¨®tka massif,SW Poland). X-ray diffraction and electron microprobe analyses allowed defining the mineral as gahnitewith the formula (Zn6.1Fe1.8Mn0.1)(Al15.8Fe0.2)O32 and unit cell parameters a = 8.1018 ¡À 0.008  ,V = 531.787 ¡À 0.156  3. Its chemical composition is typical of gahnites of igneous association. Formationof the zincian spinel was most probably controlled by local variations of crystallization conditions, e.g. thevariations of a Zn/Fe ratio in a pegmatitic fluid or of oxygen fugacity.
%K gahnite
%K zincian spinel
%K Siedlimowice
%K Strzegom pegmatite
%U http://www.ptmin.agh.edu.pl/vol35no2/vol35no2_2.pdf