Thin-platy crystals of brookite

Abstract

The crystals of this mineral from the Museum of the Mining Institute had already been systematically described by me in a special article. Recently, the museum has received two new interesting small crystals of this mineral. What is most striking is their extraordinary thinness, reaching 0.1 mm with a planar dimension larger than a square centimetre. With such extreme differences, it is especially instructive to raise the question of the existence of a relationship between form and combination.

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