Thin-plate crystals of brookite

Abstract

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