Euclase 1089326 181963900 2008-01-03T21:52:50Z PixelBot 5570079 robot Adding: [[de:Euklas]] [[Image:Euclase_1.jpg|thumb|200px|Euclase, [[Brazil]]]] [[Image:Euclase.jpg|thumb|200px|Euclase, [[Brazil]]]] '''Euclase''' is a [[beryllium]] [[aluminium]] [[hydroxide]] [[Silicate minerals|silicate]] mineral (BeAlSiO<sub>4</sub>(OH)). It crystallizes in the [[monoclinic]] [[crystal system]] and is typically massive to fibrous as well as in slender prismatic crystals. It is related to [[beryl]] (Be<sub>3</sub>Al<sub>2</sub>Si<sub>6</sub>O<sub>18</sub>) and other beryllium minerals. It is a product of the decomposition of beryl in [[pegmatite]]s. It was first reported in 1792 from the Orenburg district in the southern [[Urals]], [[Russia]]. Its [[Type locality (geology)|type locality]] is Ouro Prêto, [[Minas Gerais]], Southeast Region, [[Brazil]]. ==References== *[http://webmineral.com/data/Euclase.shtml Webmineral data] *[http://www.mindat.org/min-1418.html Mindat with location data] *[http://rruff.geo.arizona.edu/doclib/hom/euclase.pdf Mineral Data Publishers PDF] [[Category:Silicate minerals]] [[Category:Beryllium minerals]] {{mineral-stub}} [[de:Euklas]] [[nl:Euklaas]] [[ru:Эвклаз]]