Apophyllite under polarized light William Home Lizars
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Apophyllite under polarized light
Three figures showing a variety of the Faroe Islands mineral Apophyllite (named Tesselite by David Brewster) viewed under the microscope. Figure 1 Faroe Apophyllite viewed under polarized light at x50 magnification. Figure 2 Colours produced by Apophyllite "when crossed by a plate of sulphate of lime, which gives one unified blue tint. Figure 3 Circular system of rings round the axis of "Apophyllite Surcomposee." Plate 21 from the paper "Account of a remarkable structure in Apophyllite, with observations on the optical peculiarities of that mineral", by David Brewster, originally published in Transactions of the Royal Society of Edinburgh, volume 9 (1823) pp.317-336. Sir David Brewster (1781-1868) Scottish physicist, was elected a Fellow of the Royal Society in 1815.
Original: engraving. 1823
- Image reference: RS-10042
- The Royal Society
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