Abstract
PART I. ON THE COLOURING-MATTER OF THE EMERALD. FROM the time of Vauquelin's analyses, the colour of the emerald was always regarded as due to the presence of oxide of chromium, until the publication of the memoir of Lewy, who ascertained that emeralds contained that element, and concluded that the colour was due to the presence of some organic substance. Lewy also affirmed that the deepest tinted emeralds contained the most carbon. Wöhler and Rose, on the other hand, having exposed emeralds to a temperature equal to the fusing-point of copper for one hour, without their losing colour, and also having fused colourless glass with minute quantities of oxide of chromium and obtained a fine green glass, considered chromium and not organic matter to be the cause of the colour.
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Researches on Emeralds and Beryls*. Nature 8, 254–255 (1873). https://doi.org/10.1038/008254a0
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DOI: https://doi.org/10.1038/008254a0