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| Mineral: |
quartz |
| Gem: |
Montana agate (cryptocrystalline) |
| Size: |
10 x 20 mm |
| Carat: |
11.2 ct |
| Cut: |
retangular cabochon |
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| Origin: |
Montana |
| General Info: |
Agate (achates) was named from the river Achates, now the Drillo, in Sicily, where the stone was first identified. It is cryptocrystalline quartz (micro crystals) usually with a banded pattern (although not always). |
| Additional Information |
| Montana agate tends to have a very clear base with wispy brown/orange clouds or banding. It may also have dark mossy areas, including plumes or dendrites It has a relatively distinctive color an patterning that is easy to spot once you have seen it. Cut by author. Tis sample shows a few dendrites and dark mossy patches. Cut by author. |
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