From teaching experience. X. Regular, semi-regular and irregular plane partitions

The article deals with regular, semi-regular and irregular plane partitions, among the latter are partitions into equal polygons arbitrary simple knots. It continues author's supplementary lectures to university textbook «Crystallography» by G. M. Popov I. Shafranovsky, which was recommended students of geology St. Petersburg Mining University. new topic is interesting because first problem solved elementary in form a Diophantine equation, second algorithmic enumeration variants, third related 18th Gilbert not exhausted yet, fourth shows transition geometry quasi-crystalline amorphous structures. gives examples easily formulated but difficult solve problems encourages be scientifically creative geometric crystallography disciplines (petrography, materials science). presentation theory illustrated urban interiors Petersburg.