Andesine — specimen 0320, photo © NMNHS
Democratic Republic of the Congo
Weight: 1.28 ct; size: 7.87 | 6.93 | 4.34 mm; shape: hexagon; colour: medium dark red; very slightly brownish; clarity: eye clean; cut: excellent; treatment: diffusion.
Very clean specimen; design ‘Hexaelongatis 2’, excellent cut by Tan Pen.
More information from ‘Classification’
A variety of albite; plagioclase feldspar with an albite:anorthite molar ratio ranging from 50:50 to 70:30.