Pleonaste — specimen 0442, photo © NMNHS
Pleonaste — specimen 0442
Thailand, Kanchanaburi, Bo Phloi
Weight: 1.29 ct; size: 6.85 | 5.89 | 4.88 mm; shape: hexagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; design ‘Hexamixtum S 42-43’, 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.