Pleonaste — specimen 0671, photo © NMNHS
Pleonaste — specimen 0671
Thailand, Kanchanaburi, Bo Phloi
Weight: 1.38 ct; size: 7.61 | 4.83 | 3.84 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.