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Ch. 5: Ominous Luminous Stones

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OMINOUS AND LUMINOUS STONES            169
Bologna, where it appeared in the fissures of the moun­tain, after torrential rains.
The various phenomena of fluorescence and phospho­rescence undoubtedly explain some at least of the legends
regarding luminous stones, superstition or fantasy hav­ing here as in most other cases a certain substratum of fact. This class of physical phenomena has been made the subject of special investigation by the author, as many as 13,000 specimens of various minerals having
Ch. 5: Ominous Luminous Stones Page of 467 Ch. 5: Ominous Luminous Stones
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