The 15 cent stamp is a photograph of a thin section of granite as seen in plane polarized light through a petrological microscope. A thin slice of the rock initially cut by a diamond impregnated saw blade has subsequently been ground to a thickness of about 0.03 mm and is attached to a glass microscope slide. The section is magnified 20 times and shows a flake of brightly coloured muscovite mica in an aggregate of finer grained quartz and feldspar.
Details
- Designer: From photographic studies by University of Rhodesia and Department of Geological Survey
- Printer: Mardon Printers (Pvt.) Ltd., Salisbury, Rhodesia
- Process: Lithography
- Paper: Chromo with brown gum
- Watermark: None
- Perf: 14.5 (comb)
- Cylinders:
- 1A (Black) 1A (Light Pink) 1A (Yellow) 1A (Cyan)
- 1B (Black) 1B (Light Pink) 1B (Yellow) 1B (Cyan)
- Sheet: R5 x10 (50)
- Quantity: 250,000
Sheet Numbers
