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Dwarves' Earth Treasures Museum:
Orellanita ("Crater") Agates
Province of Chubut, Argentina, Patagonia, South America
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.    First discovered on the Orellanita Ranch, they are better known as Crater Agate (or Red Fox Agate) which refers to the fact that the agates were found close to an ancient crater of volcano. It was insisted that they be called "Orellanita Agates" after the owner of the land where those agates are found. The typical colors are  black, very dark gray and dark yellow, and I have seen very few ones with blue color (rare?). Almost all agates are hollow, and tend to be coated with heulandite and other zeolite minerals, and some contain hematite inclusions. Some black agates come with bright red hollow centers making them quite desirable, and it is rare to find any crater agates that have not been fractured.

Rare red & blue colors



Yellow Crater Agate with bright reddish interior.


Rare to find a Crater Agate wtih so much red color like this pair above.