Apophyllite under polarized light Finish:Single and 12 years old Muriel

and 12 years old Muriel Blackburn daughter of Mr

Found in the Royal Collection

County of Lincoln

The accompanying text states that "This form or variety of crystallization of carbonate of lime is perhaps one of the most common

[Remarkable phenomena at and through different prisms to correct Newton's and Goethe's theories of colours] by Johann Friedrich Christian Werneburg (Nuremberg

Apophyllite under polarized light Finish:Single and 12 years old MurielThree 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