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Butlerite (Fe OH SO4 2H2O) from Santa Elena mine, province of San Juan, Argentina

1999; Museo Argentino de Ciencias Naturales Bernardino Rivadavia e Instituto Nacional de Investigación de las Ciencias Naturales; Volume: 1; Linguagem: Inglês

10.22179/revmacn.1.130

1853-0400

L. F. Aristarain,

Metal Extraction and Bioleaching

Butlerite (Fe OH SO 4 2H 2 O) from Santa Elena mine, province of San Juan, Argentina. Idiomorphic crystals of Butlerite from Santa Elena mine, Calingasta, San Juan, Argentina, were used for this study. Butlerite (Fe OH SO 4 2H 2 O) has the following characteristics: monoclinic, Prismatic class, space group P 2 1 / m ; a = 6.499(1), b = 7.378(1), c = 5.848(1) Å, ß = 108º28'(5), a:b:c = 0.8809:1:0.7926, cell volume 265.98 Å 3 , Z =2. The transparent crystals are colorless to pale yellow, the fine aggregates are yellow orange, the streak is pale yellow, the luster is vitreous. The crystals are tabular, measuring up to 1 mm across; the predominant forms are {001}, {100}, {110}, {011}, and {101}. The strongest peaks in the X-ray powder diagram are, in Å: 4.98 (100), 3.165 (52), 3.597 (17), 3.234 (14), 2.495 (14), 4.74 (9), 4.43 (9). Butlerite is biaxial (+), a = 1.595(1), ß = 1.666(1), g = 1.743(1) Na light, 2 V 85º, Z = b , X Ù c = -17º, pleochroism X = colorless, Y = faint yellow, Z = light yelow, high birefringence, cleavage {100} very good, fragile, hardness 2 1/2, density 2.552 g/cm 3 (meas.), 2.559 g/cm 3 (calc.). Parabutlerite, the orthorhombic dimorph, dipyramidal class (2/ m 2/ m 2/ m ), spatial group Pmnb , is associated with butlerite.