Schultenite from King County, Washington, USA; a second occurrence, and review

Abstract

ABSTRACT. Schultenite, PbHAsO,, 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/crn 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 P2/a; the unit cell parameters refined from the X-ray powder diffraction data are: a 5.827 (3)

The Chemistry of Formation of Some Secondary Arsenate Minerals of Cu(II), Zn(II) and Pb(II)

“…Of these, the last two are found in small amounts at a number of localities around the world. Schultenite is so far reported only from the oxide zone at Tsumeb, a locality in the Black Forest, Germany, and an American deposit (Keller and Bartelke, 1982;Walenta, 1980Walenta, , 1981Falls et al, 1985). We have chosen to determine their stabilities because of their association with some of the previously mentioned arsenates of copper(II), as well as the fact that they constitute the simplest series in a complex assemblage formed when copper, lead and zinc minerals oxidize in the presence of arsenate ions.…”

Schultenite from Caldbeck Fells, Cumbria: the first British occurrence

“…Walenta (1980 and1981) recorded schultenite from localities in Germany where associated supergene minerals include carminite, duftite, Ba-pharmacosiderite and scorodite. Falls et al (1985) reported the mineral from a supergene assemblage within a pocket of partially oxidized sulphide in a quartz-arsenopyrite-galena-sphalerite-chalcopyrite vein at King County, Washington, USA. Supergene minerals recorded from this vein are anglesite, aurichalcite, beudantite, cerussite, mimetite and smithsonite.…”