Klebelsbergite, Sb.O4(OH)2SO4: redefinition and synthesis
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چکیده
Klebelsbergite is verified as a valid mineral species, in museum specimens from the type locality, Baia Sprie (Felscib6nya), Rumania. Klebelsbergite occurs as pale yellow to orange-yellow crystals radially grown on stibnite. Wet-chemical analysis of synthetic klebelsbergite, supported by electron microprobe analyses of natural material, gives Sb 71.78, S 4.65, }{2O 2.69, O 20.88Vo (by di-fference). The empirical cell contents are SboorOroo(SO4)' l.03HrO with an ideal formula Sb4O4(OH)rSOo. The crystals are tabular or acicular elongated [001], flattened {010}. The mineral is orthorhombic, P c m b o r P c 2 , b , a : 1 1 . 2 7 9 ( 2 ) , b : 1 4 . 9 0 9 ( 3 ) , c : 5 . 7 6 4 8 ( 6 ) A ; Z : 4 . D ( m e a s ) : 4 . 6 2 ( 6 ) , D(calc) : 4.698/cm3. The strongest lines of the X-ray powder pattern are 6.22(s)(120), 3.892(s)(2ll), 3.5as(s)(221), 3.1s0(s)(301), 3.131(vs)(231), 2.830(s)(012), 2.435(s)(r32), 1.805(s)(213). Klebelsbergite has vitreous luster, yellow streak, and no distinct cleavage. The mineral is optically biaxial with large 2V, about7Do, B 1.95, and is not pleochroic. VHN : 200 (l0g load). Single crystals of klebelsbergite were synthesized by boiling 2 g of SbrO, with 600 ml of I N HrSO4 for four days. Synthetic crystals are tabular, elongated [001], flattened {010}. The space group, cell parameters, and powder-di,ffraction data are essentially identical to those of natural klebelsbergite. The crystals decompose by dehydration at 273"C.
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