Editing Amblygonite (section)

==History==
The mineral was first discovered in [[Saxony]] by [[August Breithaupt]] in 1817, and named by him from the Greek ''amblus'', blunt, and ''gonia'', angle, because of the obtuse angle between the cleavages. Later it was found at Montebras, Creuse, [[France]], and at Hebron in [[Maine]]; and because of slight differences in optical character and chemical composition the names montebrasite and hebronite have been applied to the mineral from these localities.The term amblygonite has been used interchangeably in mining, whether this mineral or montebrasite was extracted. In fact, montebrasite is much more common than amblygonite, which is a rare mineral.<ref>{{Cite web |title=Ambligonite |url=https://www.mindat.org/min-2763.html |website=Mindat}}</ref> It has been discovered in considerable quantity at Pala in San Diego county, [[California]];  Caceres, [[Spain]]; and the [[Black Hills]] of [[South Dakota]]. A blue form of amblygonite-montebrasite has been described from Rwanda. The largest documented single crystal of amblygonite measured 7.62 × 2.44 × 1.83&nbsp;m and weighed about 102 tons.<ref>{{cite journal| url = http://www.minsocam.org/ammin/AM66/AM66_885.pdf| journal = American Mineralogist| volume = 66| pages = 885–907| year= 1981| title= The largest crystals| author = P. C. Rickwood}}</ref>