Andesine — specimen 0726, photo © NMNHS
Weight: 0.44 ct; size: 5.18 | 4.53 | 3.70 mm; shape: hexagon; colour: medium dark red; very slightly brownish; clarity: slightly included; cut: excellent; treatment: diffusion.
Slightly included specimen; design ‘Hexamixtum S 41-32’ [pavilion angle changed to 45.00], 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.