Description
the common nighthawk
He is holding out a paper
circa 1953
Grey Coat Hospital
Amethyst under polarized light Product:Greetings card the common nighthawkSixteen figures showing specimens of amethysts viewed under polarized light and exhibiting veined structures. Brewster notes in his text: 'The observations are the result of an immense variety of experiments, which accidental circumstances put it in my power to make upon this interesting mineral. Having access to whole bagfuls of amethystine pyramids from the Brazils, in the possession of Mr Alexander, lapidary in Edinburgh, I have examined some
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