Pleonaste — specimen 0648, photo © NMNHS
Pleonaste — specimen 0648
Thailand, Kanchanaburi, Bo Phloi
Weight: 1.08 ct; size: 7.20 | 6.23 | 3.68 mm; shape: hexagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; design ‘Hexamixtum S 41-32’ [crown angle changed to 21.00], 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.