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Obsidian — specimen 0742, photo © NMNHS
Obsidian — specimen 0742, photo © NMNHS

Obsidian — specimen 0742

Origin

no locality data
Data

Weight: 1.20 ct; size: 6.75 | 5.79 | 3.47 mm; shape: rectangle; colour: black; clarity: opaque; cut: excellent; treatment: none.
Notes

Clean specimen; design ‘Rectangulum Cab’, excellent cut by Tan Pen.

More information from ‘Classification’

Obsidian

A rock; a mixture of cryptocrystalline grains of silica minerals in a glass-like suspension.


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