Петрографическое определение каменных литейных форм из Днепрово-Каменки

All submitted samples are made from same breed which represents a talc slate of greenish color with stains of the brownish shade. Pravdino is the large deposit of talc slates located 55-60 km to southeast. The submitted collection of the casting moulds has non-uniform structure of breed and has been conditionally divided into four groups on the basis of the various degree of granularity: 1-№№ 5, 8; 2 - №№ 1, 6, 7, 9; 3 - №№ 2, 4, 11; 4 - №№ 10, 12.