Schultenite from King County, Washington, USA; a Second Occurrence, and Review

R. Falls, B. Cannon and J. A. Mandarino
Department of Mineralogy and Geology, Royal Ontario Museum, 100 Queen's Park, Toronto, Ontario, Canada M5S 2C6
Bart Cannon Minerals, 1041 NE 100 Street, Seattle, Washington, USA 98125
Department of Mineralogy and Geology, Royal Ontario Museum, 100 Queen's Park, Toronto, and Department of Geology, University of Toronto, Toronto, Ontario, Canada M5S 2C6

Abstract: Schultenite, PbHAsO4, 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/cm3 and a calculated density of 6.079(4) g/cm3. 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 P2/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) Å3; Z = 2; a:b:c = 0.8642:1:0.7188. The forms {010}, {001}, and {3¯22} were observed on the Washington schultenite crystals.

Keywords: schultenite • King County • Washington

Mineralogical Magazine; March 1985 v. 49; no. 350; p. 65-69; DOI: 10.1180/minmag.1985.049.350.08
© 1985, The Mineralogical Society
Mineralogical Society (www.minersoc.org)