Gemmology
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Amethyst

A violet variety of quartz. The colour is caused by iron impurities in the 10s to 100s parts per million range.

See:
Amethyst — specimen 0224
Amethyst — specimen 0224, photo © NMNHS

Material from ‘Repository’

29 specimens: 0675 — 0.74 ct, no locality data; 0676 — 0.61 ct, no locality data; 0678 — 0.56 ct, no locality data; 0679 — 0.67 ct, no locality data; 0681 — 0.58 ct, no locality data; 0703 — 0.57 ct, no locality data; 0706 — 0.45 ct, no locality data; 0467 — 0.45 ct, no locality data; 0085 — 0.89 ct, Uruguay; 0612 — 0.91 ct, Uruguay; 0344 — 0.44 ct, Uruguay; 0402 — 0.76 ct, no locality data; 0224 — 3.40 ct, Brazil; 0368 — 0.83 ct, no locality data; 0091 — 2.21 ct, Zambia; 0193 — 8.68 ct, no locality data; 0199 — 2.83 ct, no locality data; 0232 — 3.56 ct, no locality data; 0169 — 1.51 ct, Zambia; 0121 — 6.93 ct, Brazil; 0249 — 32.00 ct, Brazil; 0406 — 0.48 ct, no locality data; 0218 — 5.08 ct, Brazil; 0228 — 3.50 ct, Brazil; 0170 — 0.93 ct, Uruguay; 0336 — 2.05 ct, Bolivia; 0415 — 0.67 ct, Mozambique; 0702 — 0.60 ct, no locality data; 0683 — 1.53 ct, Brazil.


Gallery view