Sanidine — specimen 0017, photo © NMNHS

Sanidine — specimen 0017

Origin

South Asia

Sri Lanka

Data

Weight: 1.08 ct; size: 8.15 | 6.12 | 4.20 mm; shape: oval; colour: light grey; clarity: eye clean; cut: very good; treatment: none.

Notes

Very clean specimen; very good mixed style cut. Source: John Bradshaw, Coast to Coast Rare Stones International.

More information from ‘Classification’

Sanidine

Most common in felsic volcanic rocks; in volcanic glass; also from mafic, high-temperature contact metamorphic, and hydrothermally altered rocks; from eclogite nodules in kimberlite (Anthony et al., 2001—2005).