What is Amphibole?
[[File:Tremolite-121232.jpg|thumb|Amphibole ([[Tremolite]])]] '''Amphibole''' is a group of [[Silicate mineral|inosilicate]] [[mineral]]s. They form prism or needlelike crystals.<ref>{{cite web |url=http://www.theodora.com/geology/glossarya.html#amphibole |title=Amphibole |work=Dictionary of Geology |access-date=2013-01-21}}</ref> Many of them are [[asbestos]]. They are double chain {{chem|SiO|4}} [[tetrahedron|tetrahedra]], linked at the vertices. Usually they contain [[ion]]s of [[iron]] and/or [[magnesium]] in their structures. Amphiboles can be green, black, colorless, white, yellow, blue, or brown.<ref>[http://www.mindat.org/min-207.html Mindat, Amphibole Supergroup]</ref> == References == {{reflist}} [[Category:Minerals]]