Schultenite from King County, Washington, USA; a second occurrence, and review
1985; Cambridge University Press; Volume: 49; Issue: 350 Linguagem: Inglês
10.1180/minmag.1985.049.350.08
ISSN1471-8022
AutoresRobert B. Falls, Beekman C. Cannon, J. A. Mandarino,
Tópico(s)Iron oxide chemistry and applications
ResumoAbstract Schultenite, PbHAsO 4 , known only from Tsumeb, Namibia, has been identified from a second occurrence: near North Bend, King County, Washington, USA. It occurs as euhedral crystals in a quartz-arsenopyrite-galena vein. It has a measured density of 6.07(3) g/cm 3 and a calculated density of 6.079(4) g/cm 3 . The white to colourless crystals have a white streak, adamantine lustre, and fluoresce dull yellow under long wave ultraviolet light. Schultenite is monoclinic. Pa or P 2/ a ; the unit cell parameters refined from the X-ray powder diffraction data are: a 5.827(3), b 6.743(3), c 4.847(3) Å, β 95.34(5)°; V 189.6(1) Å 3 ; Z = 2; a : b : c = 0.8642:1:0.7188. The forms {010}, {001}, and {3̄22} were observed on the Washington schultenite crystals.
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