Hessite

Hessite is a mineral form of disilver telluride (Ag₂Te). It is a soft, dark grey mineral which forms monoclinic crystals.

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It is named after Germain Henri Hess (1802–1850).

Hessite is found in the USA in Eagle County, Colorado and in Calaveras County, California and in many other locations.

Stützite (Ag₇Te₄) and empressite (AgTe) are related silver telluride minerals.

References

• webmineral.com entry
• Mindat.org entry