Stibiconite

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This is a classic from Mexico: a large, sharp crystal of stibnite (antimony sulfide) that has been pseudomorphed by stibiconite (antimony oxide hydroxide), the sulfur atoms having been lost in the process. This is not a surface replacement or coating, but a true pseudomorphing, where the crystal is stibiconite clear through, but retaining the sharp form of the former stibnite.