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Russia | |
| Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German). |
| Kissin, Aleksander, Gottman, Irina, Sustavov, Sergei, Murzin, Valery, Kiseleva, Daria (2020) The First Find of Cr2O3 Eskolaite Associated with Marble-Hosted Ruby in the Southern Urals and the Problem of Al and Cr Sources. Minerals, 10 (2) 101 doi:10.3390/min10020101 Local geolofist S.V.Kolesnichenko data |
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| I.V.Pekov. E.A.Vlasov. E.A.Gerasimova Pitkyarantskaya mineralogical practice, Max Press, 2008, 68pp (in Russisan) |
Pitkyaranta mining district, Republic of Karelia, Russia