Pleonaste — specimen 0665, photo © NMNHS
Pleonaste — specimen 0665
Thailand, Kanchanaburi, Bo Phloi
Weight: 1.88 ct; size: 9.27 | 5.21 | 3.94 mm; shape: octagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; design ‘Octangulum’, 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.