how to facet
gemstone main cabochon creation
min data

Mineral: quartz
Gem: Montana agate (cryptocrystalline)
Size: 10 x 20 mm
Carat: 11.2 ct
Cut: retangular cabochon
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.
This is a sample of the rough agate, showing a bluish clear base material, with the distinctive orangeish wisps, a few darker bands, and some miscellaneous dendrites and moss.