23x19x3 mm fragment of Ludwigite-Kotoite skarn with total contents of Pertsevite and its hydroxyl analogue (IMA2008-060) about 5 wol. %. Pertsevite group minerals are unvisible by eye and form 20-50 mkm thick rims around humite group minerals grains on contact with kotoite. Collected by Nikolai N. Pertsev in early 60th, author's field number of the specimen is B-814. Pavel M. Kartashov collection and photo.
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