Pleonaste — specimen 0673, photo © NMNHS
Pleonaste — specimen 0673
Thailand, Kanchanaburi, Bo Phloi
Weight: 0.73 ct; size: 5.33 | 5.33 | 3.65 mm; shape: octagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Clean specimen; design ‘Eight’ by Glenn & Martha Vargas, 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.