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Pleonaste
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Pleonaste — specimen 0666, photo © NMNHS
Pleonaste
—
specimen 0666
Origin
Southeast Asia
Thailand, Kanchanaburi, Bo Phloi
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
More information from ‘Classification’
Pleonaste
An intermediate variety of the hercynite-spinel series, iron-rich spinel or magnesium-rich hercynite. Often called black spinel.
Gemmology — gemstones
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