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Oligoclase — specimen 0274, photo © NMNHS
Oligoclase — specimen 0274, photo © NMNHS

Oligoclase — specimen 0274

Origin

East Africa
Madagascar
Oligoclase — specimen 0274, locality map
Data

Weight: 1.61 ct; size: 10.64 | 7.20 | 4.54 mm; shape: hexagon; colour: very light very slightly bluish green; clarity: eye clean; cut: very good; treatment: none.
Notes

Very clean specimen; design ‘Hexaelongatis 44-30’, very good cut by Tan Pen.

Other specimens
Oligoclase — specimen 0072Oligoclase — specimen 0285

More information from ‘Classification’

Oligoclase

A variety of albite; plagioclase feldspar with an albite:anorthite molar ratio ranging from 90:10 to 70:30.


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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.