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Cordierite — specimen 0380, photo © NMNHS
Cordierite — specimen 0380, photo © NMNHS

Cordierite — specimen 0380

Origin

East Africa
Tanzania
Cordierite — specimen 0380, locality map
Data

Weight: 0.19 ct; size: 5.03 | 3.03 | 2.08 mm; shape: oval; colour: medium light blue; very slightly greyish; clarity: eye clean; cut: good; treatment: none.
Notes

Very clean specimen; good mixed style cut. Source: Gary Eisenberg, Knoxville, Tennessee.

Other specimens
Cordierite — specimen 0025Cordierite — specimen 0123Cordierite — specimen 0214Cordierite — specimen 0381Cordierite — specimen 0389Cordierite — specimen 0390

More information from ‘Classification’

Cordierite

In thermally metamorphosed argillaceous sediments and regionally metamorphosed schists, gneisses; in mafic igneous rocks and granites (Anthony et al., 2001—2005). The gemstone bears the name iolite.


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