Amazonite

A green to blue-green variety of microcline. The colour is usually caused by an elevated content of lead.

See:

Material from ‘Repository’

2 specimens: 0100 — 6.92 ct, Brazil; 0101 — 4.64 ct, Brazil.

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