Gemmology
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Smoky quartz

Varieties | Names:

Smoky-grey, brown to black quartz coloured by Al-based and irradiation-induced colour centres.

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Material from ‘Repository’

12 specimens: 0362 — 38.04 ct, Brazil; 0674 — 0.39 ct, Brazil; 0251 — 7.49 ct, no locality data; 0682 — 0.45 ct, Brazil; 0202 — 11.11 ct, Brazil; 0204 — 1.81 ct, no locality data; 0350 — 1.27 ct, no locality data; 0359 — 3.76 ct, Brazil; 0401 — 4.20 ct, Brazil; 0719 — 2.91 ct, Brazil; 0135 — 2.80 ct, Brazil; 0136 — 28.98 ct, Brazil.


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