Synthesis of gerstleyite
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Gerstleyite [Na<SUB>2</SUB>Sb<SUB>8</SUB>S<SUB>13</SUB>·2H<SUB>2</SUB>O] was successfully synthesized by hydrothermal method for the first time. The syntheses condition was as follows: starting material Sb<SUB>2</SUB>S<SUB>3</SUB> and Na<SUB>2</SUB>S·9H<SUB>2</SUB>O soln. with mixing ratio of [Sb/Na]=4.0 and 8.0 (mol/mol), heating temperature 210 and 220°C, and heating time of 80 hours. The products were identified to be gerstleyite by means of X-ray powder diffraction. Space group and lattice constants were examined by a Weissenberg camera. Crystal data: monoclinic, <I>Cm</I>, <I>a</I>=9.945(2), <I>b</I>=23.134(3), <I>c</I>=7.108(1) Å, β=127.828(8)°. The lattice parameters of the synthetic gerstleyite are 0.2∼0.4% larger than those reported for natural gerstleyite [Na<SUB>2</SUB>(Sb, As)<SUB>8</SUB>S<SUB>13</SUB>·2H<SUB>2</SUB>O], in which about one tenth of the Sb atoms were substituted by smaller As atoms.
- Mineralogical Journal
Mineralogical Journal 18(1), 17-22, 1996-01-01
Japan Association of Mineralogical Sciences