Occurrence is in Gunnison County, Colorado, Arizona and New Mexico in the United States.
It is also reported from Kalgoorlie, Western Australia and Dalarna and Värmland, Sweden.
[2] It was first described in 1927 for an occurrence in the Good Hope Mine in the Vulcan District of Gunnison County, Colorado.
[3] It was named for mine owner Louis Weiss.
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