Corderoite

Corderoite is an extremely rare mercury sulfide chloride mineral with formula Hg₃S₂Cl₂. It crystallizes in the isometric crystal system. It is soft, 1.5 to 2 on the Mohs scale, and varies in color from light gray to black and rarely pink or yellow.

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It was first described in 1974 for occurrences in the McDermitt Mercury mine in Humboldt County, Nevada.

References

• Webmineral data
• Mindat with location data