English: (rough english translation from russian wp)Zhigulev - rock and aluminum ore , consisting mainly of the mineral alunite . Local term . According to the structure and appearance - variegated breccia . Color fickle and changeable in a wide range of snow- white, light gray, gray, gray- green, yellow , yellow, yellow with red spots , red, reddish brown , magenta , pink, lilac , purple. Along with other components , contains aluminum and sulfur. The material was not sufficient grounds (complete set of necessary studies composition and crystalline structure) described K. V. Polyakov as a new mineral composition [2Al2O3 • SO3 • 4H2O]. Not recognized by the Commission on New Minerals and OWS not approved by the Commission on New Minerals IMA as a mineral species. Contains 57,3% Al2O3, 22,5% SO3 and 20.2 % H2O . The name is given D.Sc. prof. Department of Geology and Geography of the Kuibyshev Pedagogical Institute and the teacher K. V. Polyakov.