Apophyllite under polarized light Finish:Single Half-length portrait of Samuel Chandler

Half-length portrait of Samuel Chandler in a grey wig

with vessels on the River Thames

Centre Court

Oval surround with decorative acanthus

24th February 1969

Apophyllite under polarized light Finish:Single Half-length portrait of Samuel ChandlerThree 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