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Straczekite, a new calcium barium potassium vanadate mineral from Wilson Springs, Arkansas

Straczekite, a new calcium barium potassium vanadate mineral from Wilson Springs, Arkansas

Mineralogical Magazine 48, Part 2(347): 289-293

Straczekite, a new calcium barium potassium vanadate from Wilson Springs, Arkansas, occurs as a rare secondary mineral in fibrous seams in gangue. The dark greenish-black crystals are very soft, thin laths up to 0.5 mm in length, forming thick masses. Good electron diffraction patterns yielded a monoclinic unit cell in space group C2/m, C2, or Cm. The cell parameters were refined by least squares analysis of Guinier-Haegg X-ray powder data: a 11.679(2), b 3.6608(4), c 10.636(2) Aa, beta = 100.534(4) degrees (strongest lines are: 003, 3.486, 100; 001, 10.449, 50; 020 1.8306, 50; 601/510, 1.9437, 15; 111/203, 3.255, 10; 311/312, 2.492, 10; 021, 1.8030, 10). Chemical analysis yields the formula: (Ca (sub 0.39) Ba (sub 0.31) K (sub 0.33) Na (sub 0.11) )(V (sub 1.59) (super 4+) V (sub 6.31) (super 5+) Fe (sub 0.10) (super 3+) )O (sub 20.02) (H (sub 2) O) (sub 2.9) . The calculated density is 3.21 g/cm (super 3) . It represents a new series of layer vanadate minerals of general formula M (sub x) V (sub 8) O (sub 20) .yH (sub 2) O, similar in properties but distinct from the hewettite series (M (sub x) V (sub 6) O (sub 16) .yH (sub 2) O).--Modified journal abstract.

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Accession: 020098426

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DOI: 10.1180/minmag.1984.048.347.16

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