Andesine — specimen 0349, photo © NMNHS
no precise locality [Africa]
Weight: 2.35 ct; size: 9.44 | 6.60 | 6.20 mm; shape: octagon; colour: light yellow; strong; clarity: eye clean; cut: excellent; treatment: none.
Very clean specimen; angles [changed to 44, 44.7, 66.5 in the pavilion; skipping after 45 in the crown] as in ‘Opposing Corners 15’ by Robert H. Long, 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.