Oligoclase — specimen 0072, photo © NMNHS
Oligoclase — specimen 0072
Weight: 0.96 ct; size: 7.88 | 5.61 | 3.63 mm; shape: oval; colour: very light very slightly bluish green; clarity: eye clean; cut: fair; treatment: none.
Very clean specimen; mixed style cut.
More information from ‘Classification’
A variety of albite; plagioclase feldspar with an albite:anorthite molar ratio ranging from 90:10 to 70:30.