𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Etch figures and crystal structures

✍ Scribed by Prof. Dr. W. A. Wooster

Publisher
John Wiley and Sons
Year
1976
Tongue
English
Weight
483 KB
Volume
11
Category
Article
ISSN
0232-1300

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✦ Synopsis

Abstract

The etch figures on some of the naturally occurring faces of crystals of sodium chloride, cuprite, alpha‐quartz, tourmaline and topaz are compared with the atomic arrangements on the etched surfaces. The etch figures are influenced in their shape and orientation relative to the natural faces by a number of factors. One of these factors is the crystal structure. In every example of an etched pit bounded by straight edges, it was found that there exists in the crystal structure a continuous chain of relatively strong inter‐atomic bonds, running parallel to the straight edge. The study of tourmaline indicates the direction in which all the SiO~4~ tetrahedra are pointing relative to the external form.

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