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These "Chrysanthemum" Flowers, frozen in stone, are natural occurrences of celestite crystals in a limestone matrix. Found in Liuyang County, Hunan Province in China.

Acid lakes at the Dallol Volcano in Danakil Desert, Ethiopia | Photo by Pascal Boegli | http://en.wikipedia.org/wiki/Dallol_(volcano)

Wonderful Helioceras heteromorph ammonite! (what a curious & wonderful looking creature!)