Oxidation states: Fe2+As1-2 (AM 87.1692-1698)
There is complete solid solution between safflorite and löllingite, limited solution of cobalt in rammelsbergite and no solid solution between löllingite and rammelsbergite (AM53.1856, Mindat).
Specific gravity: 7.43
Hardness: 5 to 5½
Streak: Greyish black
Colour: Steel grey to silver white
Löllingite occurs in mesothermal deposits associated with other suphides and calcite
gangue; it is also found in pegmatites (Webmin). Associated minerals include
siderite and calcite
At the Emmons pegmatite, Greenwood, Oxford county, Maine, USA, löllingite forms masses to 15 cm across. Rare crude crystals occur in massive rhodochrosite. The Emmons pegmatite is an example of a highly evolved boron-lithium-cesium-tantalum enriched pegmatite (R&M 94.6.511).
Common impurities: Bi
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