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22-AUGUST-2008 06:13:22 - Anglesite Anglesite General Category Sulfate mineral Chemical formula PbSO4 Identification Color Colorless to white, commonly tinted gray; orange, yellow, green, blue, rarely violet Crystal habit Granular, banded, nodular to stalactitic Crystal system Orthorhombic - Dipyramidal 2/m 2/m 2/m Cleavage 001 good, 210 distinct Fracture Brittle to conchoidal Mohs Scale hardness 2.5 - 3.0 Luster Adamantine crystals, dull when massive earthy Refractive index nα = 1.878 nβ = 1.883 nγ = 1.895 Optical Properties Biaxial + Streak White Specific gravity 6.3 Fusibility 1.5 Diaphaneity Transparent to translucent References 123 Anglesite diagram illustrating its orthorhombic crystalline form Anglesite diagram illustrating its orthorhombic crystalline form Anglesite is a lead sulfate mineral, PbSO4. It occurs as an oxidation product of primary lead sulfide ore, galena. Anglesite occurs as prismatic orthorhombic crystals and earthy masses, and is isomorphous with barite and celestine. It has a high specific gravity of 6.3 due to its lead content, 74% by mass; its hardness is 2.5 - 3. Color is white, gray with pale yellow streaks. It may be dark gray if impure. It was first recognized as a mineral species by William Withering in 1783, who discovered it in the Parys copper-mine in Anglesey; the name anglesite, from this locality, was given by F. S. Beudant in 1832. The crystals from Anglesey, which were formerly found abundantly on a matrix of dull limonite, are small in size and simple in form, being usually bounded by four faces of a prism and four faces of a dome; they are brownish-yellow in colour owing to a stain of limonite. Crystals from some other localities, notably from Monteponi in Sardinia, are transparent and colourless, possessed of a brilliant adamantine lustre, and usually modified by numerous bright faces. The variety of combinations and habits presented by the crystals is very extensive, nearly two hundred distinct forms being figured by V. von Lang in his monograph of the species; without measurement of the angles the crystals are frequently difficult to decipher. There are distinct cleavages parallel to the faces of the prism 110 and the basal plane 001, but these are not so well developed as in the isomorphous minerals barite and celestite. Anglesite from Arizona Anglesite from Arizona Anglesite is a mineral of secondary origin, having been formed by the oxidation of galena in the upper parts of mineral lodes where these have been affected by weathering processes. At Monteponi the crystals encrust cavities in glistening granular galena; and from Leadhills, in Scotland, pseudomorphs of anglesite after galena are known. At most localities it is found as isolated crystals in the lead-bearing lodes, but at some places, in Australia and Mexico, it occurs as large masses, and is then mined as an ore of lead. See also LeadII sulfate References ^ http://rruff.geo.arizona.edu/doclib/hom/anglesite.pdf Mineral Handbook ^ http://webmineral.com/data/Anglesite.shtml Webmineral data ^ http://www.mindat.org/min-233.html Mindat This article incorporates text from the Encyclopædia Britannica Eleventh ion, a publication now in the public domain. Retrieved from http://en..org/wiki/Anglesite Categories: Lead minerals | Sulfate minerals Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Català Deutsch Español Euskara Français Italiano Magyar Nederlands Polski Português СрпÑ?ки / Srpski Svenska УкраїнÑ?ька This page was last modified on 10 July 2008, at 10:51
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