2
زمینشناسی و معدن::
حساس به نور
Detailed listings of specific photosensitive minerals are given in Tables 2.3, 2.4 and 2.5, and recommendations for protection are given in Section 2.5.
2.4 Listings of photosensitive minerals and gems
In some of the substances listed in Tables 2.3, 2.4 and 2.5 the photosensitivity is inherent in the material and therefore always present: examples are bromargyrite, Maxixe beryl, and proustite, In other instances the photosensitivity depends on the presence of impurities, or on the specific nature of the defects or impurities, and can vary widely even within one colour of a species.
The greatest problems arise with those materials where the photosensitivity varies with the origin.
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