Amethyst under polarized light Size:M: 60 x 45cm as can clearly be seen

as can clearly be seen in the picture

Plate 16 from the book Icones rerum naturalium

1st April 1980

Jim Baxter and Denis Law of Scotland practice before their International against Ireland

Amethyst under polarized light Size:M: 60 x 45cm as can clearly be seenSixteen 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