Pleonaste — specimen 0670, photo © NMNHS
Pleonaste — specimen 0670
Thailand, Kanchanaburi, Bo Phloi
Weight: 1.58 ct; size: 7.93 | 6.31 | 4.33 mm; shape: hexagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; design ‘Hexaelongatis 1’, 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.