Studies of Uranium Minerals (xv): Schroeckinger- Ite from Argentina and Utah*
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چکیده
Schroeckingerite crystals have been found at Moab, Utah, and San Isidro, Argentina. They are orthorhombic pseudohexagonal, fl ttened on {001 } with additional forms {010}, [ 110 ] , { 014 } , { 012 } , { 011 } , { 021 } , { 041 } , [ 1 l s ] , { 114 } , { 112 } , [ 111 ] . Un i t ce l l d imensions arel ao:9.69 A, bo:16.83, co:14.26 ({r0:b0:r0:0.5758:1:0.8473). Space group Cmmm. Z:4. Optically biaxial (-), X:c, Y:b. Argentina: nX:1.492, nY:1.543, nZ:L544. 2V:10'. G:2.550. IJtah: nX:1.49O, nY:1.537, nZ:1.538. 2V:18". G:2.5M. Calculated G:2.547. Dehydrated over HzSOn, schroeckingerite goes to NaCa3 UO:(COB)3SO4F'4H2O and becomes hexagonal with unit cell dimensions: ao:9.72 A, co : 1 1.03 (a : b : | : 1.1348). Z : 2. Optically uniaxial (). nO : 1 .581, nE : 7.532. Measured G : 2.86, calculated G: 2.87 4.
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تاریخ انتشار 2007