Sulphosalt, forms a series with gustavite
Specific gravity: 7 to 7.2
Hardness: 2 to 3
Colour: Steel grey
Common impurities: Ag,Cu,Sb
Lillianite occurs in hydrothermal veins of probable high temperature origin (Webmin, HOM). Associated minerals include
gustavite and quartz
At the La Fossa crater, Vulcano Island, Lipari, Eolie Islands, Messina Province, Sicily, Italy, excellent samples of lillianite have been found around a high-temperature fumarole, associated with cannizzarite, galenobismutite, sphalerite and selenium-bearing galena. As with other sulphosalts from Vulcano, significant selenium is invariably present (up to 2.22 weight %) (CM 39.1383-1396).
The original type locality, the Lillian mines, Printer Boy Hill, Leadville, Lake county, Colorado, USA, is now discredited because the "type material" from there later proved to be a mixture of mostly galena and galenobismutite (AM 54.579).
At the Pedro claim, King County, Washington, USA, an elongated prismatic crystal of lillianite has been found, with severe exterior corrosion, associated with aikinite, galena, neyite and gustavite (https://rruff.info/Lillianite).
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