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

as can clearly be seen in the picture

View from the River Thames showing boats and figures on the water

Interior view of the dining room at the Cock Tavern

28th September 1966

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