Wollastonite, Kilchoanite
Birkhin gabbro massif, Narin-Kunta, Irkutsk Oblast, Russia
Coarse-granular aggregate of almost pure light-grey transparent Wollastonite with very minor interstitial Kilchoanite (light, glassy, without cleavage). Rock covered by snow-white films of secondary Ca-hydrosilicates (Plombierite, Riversideite, Tobermorite etc.) along fractures and thick creamy crust of Calcite. Specimen size is 4.5x3 cm. ...
© Pavel M. Kartashov collection & photo