Gemmology
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Pleonaste — specimen 0666, photo © NMNHS
Pleonaste — specimen 0666, photo © NMNHS

Pleonastespecimen 0666

Origin

Southeast Asia
Thailand, Kanchanaburi, Bo Phloi
Pleonaste — specimen 0666, locality map
Data

Weight: 1.42 ct; size: 7.45 | 6.49 | 4.55 mm; shape: hexagon; colour: black; clarity: opaque; cut: excellent; treatment: none.
Notes

Clean specimen; design ‘Hexamixtum S 41-32’, excellent cut by Tan Pen.

Other specimens
Pleonaste — specimen 0384Pleonaste — specimen 0385Pleonaste — specimen 0463Pleonaste — specimen 0442Pleonaste — specimen 0648Pleonaste — specimen 0650Pleonaste — specimen 0670Pleonaste — specimen 0665Pleonaste — specimen 0671Pleonaste — specimen 0672Pleonaste — specimen 0673

More information from ‘Classification’


An intermediate variety of the hercynite-spinel series, iron-rich spinel or magnesium-rich hercynite. Often called black spinel.