English

On the structure of agates

"With thirty illustrations from drawings by the author." Reprinted from 'The transactions of the Geological Society of Glasgow', Vol.XI., Part II., 1900. "Contains the summarized results of many years of observation and conclusions on the formation of Scottish agates [...]. The sketches were made by him [Heddle] from actual specimens and illustrate a wide range of internal structures in typical nodules."-​-​Gemology by J. Sinkankas, entry no. 2835.

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