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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.
23
menon will be exactly the same, and have the aspect presented by Fig. 18.
If the phenomenon of double refraction is pro­duced, the conclusion may be made without hesita­tion that the stone tested is not a diamond; for the diamond, since it appertains to the cubic (mono-
metric) system, possesses simple refraction. The stone experimented on, therefore, is no doubt one of those with which the diamond is sometimes con­founded, such as the sapphire and the zircon, which possess double refraction.
Polarization.—It is well known that if a beam of light falls upon a plane and polished surface it is re-
Ch. 1: Precious Stones Introduction Page of 296 Ch. 1: Precious Stones Introduction
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