Calcite (twinned)

We bought out a pocket in 2020 from an isolated find in the Anhui Province of China. There were only 4 top specimens and this one , for its size, is VERY good. The singularly prominant glassy surfaced, twin stands proudly featuring a yellow core zoning to a deeper and then light greyish color creating most unusual phantoms. There is a touch of internal crazing on the top left side of the crystal but it is internal and, in person, is not as evident as in the photos.

Locality: Anhui Province, China

Composition: calcium carbonate