Specific gravity: 7.6 to 7.8
Colour: Brilliant creamy white, tarnishes to bright orange
Eucairite is widely distributed in selenium deposits of hydrothermal origin,
with other selenides. Associated minerals include
malachite and calcite
At Sierra de Umango, Villa Castelli, General Lamadrid department, La Rioja Province, Argentina, eucairite has been reported in a highly altered copper ore specimen associated with umangite, chalcomenite and malachite (AM 35.345), but according to Mindat (accessed November 2020) this is erroneous.
At the type locality, the Skrikerum mine, Valdemarsvik, Östergötland County, Sweden, eucairite has been found as disseminated blebs with severely tarnished surfaces in a serpentinised gangue of quartz and calcite (AM 35.345).
Back to Minerals