Detail of the crystal Anglesite, found in Oujda-Angad (Morocco) — Photo: Marco Del Torchio · CC BY-SA 3.0
Anglesite
Lead sulfate formed when the ore mineral galena oxidizes — it shares its crystal structure with barite and celestine.
Intro adapted from Wikipedia (CC BY-SA).
Anglesite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Pb(SO₄).
It crystallizes in the orthorhombic crystal system (space group Pnma). It is a member of the Baryte structural group.
Key properties: Mohs hardness 2.5–3; specific gravity 6.38; typically colorless or white or yellow or green or blue or gray; White streak; Adamantine, resinous to vitreous luster; optically biaxial.
IMA symbol Ang, grandfathered status — known before the IMA’s founding, named in 1832.
Common in the oxidized zone of lead deposits, where it may constitute an important ore.
It is found associated with Cerussite, leadhillite, lanarkite, caledonite, linarite, brochantite, malachite, mimetite, pyromorphite, wulfenite, massicot, gypsum, sulfur, galena.
The name refers to its occurrence on the island of Anglesey, Wales.
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