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. A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes In Mineralogy, shape and size give rise to descriptive terms applied to the typical appearance or habit of Crystals The many terms used by mineralogists A crystal system is a category of Space groups which characterize Symmetry of structures in three dimensions with Translational symmetry in three directions In Crystallography, the orthorhombic Crystal system is one of the seven Lattice Point groups Orthorhombic lattices result from stretching Cleavage, in Mineralogy, is the tendency of crystalline materials to split along definite planes creating smooth surfaces of which there are several named types In the field of Mineralogy, fracture is a term used to describe the shape and texture of the surface formed when a Mineral is broken The Mohs scale of mineral hardness characterizes the scratch resistance of various Minerals through the ability of a harder material to scratch a softer material 5 - 3. 0
Luster	Adamantine crystals, dull when massive earthy
Refractive index	nα = 1. Lustre (or luster) is a description of the way light interacts with the surface of a Crystal, rock, or Mineral. The refractive index (or index of Refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves is reduced inside the medium 878 nβ = 1. 883 nγ = 1. 895
Optical Properties	Biaxial (+)
Streak	White
Specific gravity	6. The streak (also called powder color) of a Mineral is the Color of the powder produced when it is dragged across an unweathered surface Specific gravity is defined as the ratio of the Density of a given solid or liquid substance to the density of water at a specific temperature and pressure typically 3
Fusibility	1. Fusibility is the ease with which a material will Melt. Materials such as solder require a low melting point so that when heat is applied to a joint the solder will melt before 5
Diaphaneity	Transparent to translucent
References	[1][2][3]

Anglesite diagram illustrating its orthorhombic crystalline form

Anglesite is a lead sulfate mineral, PbSO₄. Characteristics Lead has a dull luster and is a dense, Ductile, very soft highly A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition a highly ordered atomic structure and specific It occurs as an oxidation product of primary lead sulfide ore, galena. Galena is the natural mineral form of Lead sulfide. It is the most important Lead Ore mineral Anglesite occurs as prismatic orthorhombic crystals and earthy masses, and is isomorphous with barite and celestine. In Crystallography, the orthorhombic Crystal system is one of the seven Lattice Point groups Orthorhombic lattices result from stretching Baryte ( Ba[[Sulfur S]] O 4 is a Mineral consisting of Barium sulfate. Celestine or celestite ( Sr[[Sulfur S]] O 4 is a Mineral consisting of Strontium Sulfate. It has a high specific gravity of 6. Specific gravity is defined as the ratio of the Density of a given solid or liquid substance to the density of water at a specific temperature and pressure typically 3 due to its lead content, 74% by mass; its hardness is 2. Characteristics Lead has a dull luster and is a dense, Ductile, very soft highly 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. William Withering ( March 17, 1741, Wellington, Shropshire October 6, 1799) was an English Botanist History There are numerous Megalithic monuments and Menhirs present on Anglesey testifying to the presence of mankind in prehistory François Sulpice Beudant ( September 5, 1787 - December 10, 1850) French Mineralogist and Geologist, was born 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. Limonite is an ore consisting in a mixture of hydrated Iron(III oxide-hydroxide of varying composition 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. Sardinia (sɑrˈdɪnɪə Sardegna Sardigna or Sardinnya is the second-largest island in the Mediterranean Sea (after Sicily) 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 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. The State of Arizona ( is a state located in the southwestern region of the United States. At Monteponi the crystals encrust cavities in glistening granular galena; and from Leadhills, in Scotland, pseudomorphs of anglesite after galena are known. Leadhills is a village in South Lanarkshire, Scotland, 5¾ miles WSW of Elvanfoot. Scotland ( Gaelic: Alba) is a Country in northwest Europethat occupies the northern third of the island of Great Britain. In Geology, a pseudomorph is a Mineral compound resulting from a substitution process in which the appearance and dimensions remain constant but the mineral which 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. For a topic outline on this subject see List of basic Australia topics. The United Mexican States ( or commonly Mexico (ˈmɛksɪkoʊ () is a federal constitutional Republic in North America. An ore is a volume of rock containing components or Minerals in a mode of occurrence that renders it valuable for mining

See also

Lead(II) sulfate

References

1. ^ http://rruff.geo.arizona.edu/doclib/hom/anglesite.pdf Mineral Handbook
2. ^ http://webmineral.com/data/Anglesite.shtml Webmineral data
3. ^ http://www.mindat.org/min-233.html Mindat

• This article incorporates text from the Encyclopædia Britannica Eleventh Edition, a publication now in the public domain. Lead (II sulfate ( sulphate in British English) (PbSO4 is a white crystal or powder The Encyclopædia Britannica Eleventh Edition (1910–1911 is a 29-volume reference work that marked the beginning of the Encyclopædia Britannica The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone