Спиридонов Э. М. - Генетическая минералогия - 7. Специфические формы кристаллов - трубчатые,двойники
0:00:44 Трубчатые кристаллы
0:04:11 Кристаллы - двойники роста
0:26:33 Двойники полиморфных превращений
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