Pleonaste — specimen 0666, photo © NMNHS
Pleonaste — specimen 0666
Thailand, Kanchanaburi, Bo Phloi
Weight: 1.42 ct; size: 7.45 | 6.49 | 4.55 mm; shape: hexagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; design ‘Hexamixtum S 41-32’, excellent cut by Tan Pen.
More information from ‘Classification’
An intermediate variety of the hercynite-spinel series, iron-rich spinel or magnesium-rich hercynite. Often called black spinel.