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Abstract
It was found that the VendianCambrian rhyolites of the Maldynyrd Range (Cis Polar Urals, the Balbanyu River Basinthe large left tributary of the Kozhym River), as well as compositionally diverse products of their alteration contain elevated contents of some trace and rare earth elements. This phenomenon is known as the Maldin geochemical phenomenon [1]. Of special interest are geochemical anomalies of beryllium, the pres ence of which can be used as an argument in support of metasomatic alteration (greisenization) of rhyolites. Dif ferent modes of beryllium occurrence, including such exotic ones as Mn allanite, have been proposed. However, only one own beryllium mineral, euclase, with ideal for mula AlBe[SiO4](OH) [1, 2] was presently found.