Abstract
Now that attention has been called in NATURE (December 12, 1895, p. 135) to two papers, by Mr. Watts and Mr. Smeeth respectively, in which perlitic structure is examined with much careful detail, may I protest at once against the use made of the word “perlite” by these authors and by the writer of the note in NATURE? So many terms (“ granophyre,” “picrite,” “granulite,” &c.) have been already strained by petrographers from their original meanings, that the fine old rock-name “perlite” may also be in danger. It was invented by Beudant in 1822 (“Voyage en Hongrie,” tome i. p. 329), as a translation of the German Perlstein, and is the name of a glassy rock having a particular structure. It cannot be also used for the globules or cracks which characterise that structure.
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COLE, G. “Perlites”. Nature 53, 175 (1895). https://doi.org/10.1038/053175a0
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DOI: https://doi.org/10.1038/053175a0
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