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Ch. 1: Precious Stones Introduction

Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction Text size:minus plus Restore normal size   Mail page  Print this page
OPTICAL PROPERTIES.
21
and both images will show deviation. This is an instance of what is called double refraction.
When a body, crystallized or not, is perfectly homogeneous in all its parts, so that its elements are disposed everywhere in a uniform manner, one can easily understand that the light must traverse it regularly, and must present a single image of every object: such bodies possess the property of simple refraction.
Crystals belonging to the monometric or tesseral system, as the cube or octahedron, since their mole­cular disposition is perfectly regular, never exhibit the phenomenon of double refraction, in whatever direction they are traversed by the light; but crys­tals of all other systems possess the power of double refraction, differing in its effects as the crystal appertains to a system more or less closely related to the regular system.
As all precious stones that are highly valued are
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
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