Nenadkevichite : (Na,◻)8Nb4(Si4O12)2(O,OH)4·8H2O
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“A tabular crystal, red, nenadkevichite. Collection and photo of Gianfranco Ciccolini. Nikon D610, bellows, Schneider Kreuznach 28mm; f:4. Focal using 5.6.”
Gianfranco Ciccolini - 14th November 2015
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