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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
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PRECIOUS STONES.
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constitution of these bodies. For example, Iceland spar and aragonite, whose chemical composition is identical, both consisting of pure carbonate of lime, refract the light unequally, for the sole reason that their molecular constitution is very different.
Double Refraction.—Among diaphanous bodies there is a numerous class of substances that possess the curious quality of presenting two images of one object. If a crystal of Iceland spar is placed upon a piece of white paper bearing an inscription, as in Fig. 17, two images will be visible of every point,
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
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