Gemmology
English | Български
Where am I? > Home > Classification > Chalcedony


Quick navigation selector

Chalcedony


Traditionally defined as a fibrous cryptocrystalline variety of quartz. More recently, it has been shown that much chalcedony is a mixture of quartz and mogánite. Pure chalcedony may contain trace amounts of silanol groups.

See:

Material from ‘Repository’

84 specimens: 0088 — 1.80 ct, Brazil; 0403 — 0.66 ct, Brazil; 0180 — 4.65 ct, no locality data; 0510 — 1.70 ct, no locality data; 0511 — 1.75 ct, no locality data; 0512 — 1.65 ct, no locality data; 0580 — 2.42 ct, no precise locality [Africa]; 0591 — 3.11 ct, no precise locality [Africa]; 0225 — 3.39 ct, no precise locality [Africa]; 0688 — 0.53 ct, no precise locality [Africa]; 0418 — 0.72 ct, no precise locality [Africa]; 0558 — 2.49 ct, no precise locality [Africa]; 0179 — 1.14 ct, no precise locality [Africa]; 0183 — 1.06 ct, no precise locality [Africa]; 0404 — 2.60 ct, no precise locality [Africa]; 0265 — 1.72 ct, no precise locality [Africa]; 0348 — 1.62 ct, no precise locality [Africa]; 0684 — 0.82 ct, no precise locality [Africa]; 0685 — 1.19 ct, no precise locality [Africa]; 0686 — 0.72 ct, no precise locality [Africa]; 0687 — 1.14 ct, no precise locality [Africa]; 0689 — 2.30 ct, no precise locality [Africa]; 0690 — 0.65 ct, no precise locality [Africa]; 0691 — 1.31 ct, no precise locality [Africa]; 0692 — 0.67 ct, no precise locality [Africa]; 0693 — 0.99 ct, no precise locality [Africa]; 0694 — 2.06 ct, no precise locality [Africa]; 0695 — 1.68 ct, no precise locality [Africa]; 0019 — 6.14 ct, no precise locality [Africa]; 0205 — 9.41 ct, Bulgaria, Haskovo, Stambolovo, Rabovo, 41.60905°N 25.64801°E, 185 m; 0468 — 0.73 ct, no precise locality [Africa]; 0619 — 3.92 ct, USA, Montana, Yellowstone River; 0620 — 3.78 ct, USA, Montana, Yellowstone River; 0119 — 4.42 ct, USA, Montana, Yellowstone River; 0124 — 4.37 ct, USA, Montana, Yellowstone River; 0382 — 2.04 ct, USA, Montana, Yellowstone River; 0371 — 2.57 ct, USA, Montana, Yellowstone River; 0372 — 2.68 ct, USA, Montana, Yellowstone River; 0392 — 2.64 ct, USA, Montana, Yellowstone River; 0393 — 2.53 ct, USA, Montana, Yellowstone River; 0324 — 3.95 ct, USA, Montana, Yellowstone River; 0325 — 4.02 ct, USA, Montana, Yellowstone River; 0611 — 23.20 ct, USA, Montana, Yellowstone River; 0258 — 0.98 ct, no precise locality [Africa]; 0419 — 0.38 ct, no precise locality [Africa]; 0111 — 2.70 ct, no precise locality [Africa]; 0112 — 3.00 ct, no precise locality [Africa]; 0250 — 1.43 ct, no precise locality [Africa]; 0321 — 2.60 ct, Brazil; 0322 — 2.25 ct, Brazil; 0696 — 1.04 ct, no precise locality [Africa]; 0317 — 1.61 ct, USA, Minnesota, Crow Wing County, Cuyuna; 0332 — 1.22 ct, USA, Minnesota, Crow Wing County, Cuyuna; 0743 — 2.45 ct, Madagascar; 0745 — 1.98 ct, Madagascar; 0746 — 2.04 ct, Madagascar; 0010 — 4.68 ct, Brazil; 0552 — 1.65 ct, no precise locality [Africa]; 0553 — 2.15 ct, no precise locality [Africa]; 0566 — 2.05 ct, no precise locality [Africa]; 0474 — 4.10 ct, no precise locality [Africa]; 0270 — 3.46 ct, no precise locality [Africa]; 0394 — 1.34 ct, no precise locality [Africa]; 0537 — 3.69 ct, no precise locality [Africa]; 0554 — 2.68 ct, no precise locality [Africa]; 0582 — 2.91 ct, no precise locality [Africa]; 0471 — 0.59 ct, no precise locality [Africa]; 0020 — 6.61 ct, Botswana; 0021 — 6.56 ct, Botswana; 0215 — 2.29 ct, no precise locality [Africa]; 0216 — 2.31 ct, no precise locality [Africa]; 0610 — 6.08 ct, Zimbabwe, Mashonaland West, Makonde, Mutorashanga; 0107 — 0.52 ct, no precise locality [Africa]; 0292 — 0.51 ct, no precise locality [Africa]; 0697 — 0.49 ct, no precise locality [Africa]; 0473 — 0.61 ct, no precise locality [Africa]; 0181 — 2.59 ct, no locality data; 0182 — 2.53 ct, no locality data; 0465 — 0.61 ct, no precise locality [Africa]; 0600 — 18.55 ct, USA, Idaho, Owyhee County, Bruneau; 0627 — 15.92 ct, Mexico, Jalisco, San Cristóbal de la Barranca (north, on the Jalisco-Zacatecas border); 0724 — 2.07 ct, Mexico; 0725 — 1.53 ct, Mexico; 0323 — 2.65 ct, Mexico.


Gallery view