... Mineral Drawings .. ... Calcite Cave Formation. ... Indian ink on artboard. (see V. A. Slyotov in Cave Geology, vol. ... Flint Concretion with Quartz. ... Hematite spherulites of two generations with lepidocrocite. 4cm. ... Skeletal crystal of magnetite, replased by hematite. ... Showing the splitting of "packets" of lamellar crystals twined on (100); from a 4-cm specimen from Dzhezkazgan, Kazakhstan. ... The album was published at the authors’ expenses, 'Ocean Pictures', Moscow, 2004 . ...