Eskebornite

eskebornite

clausthalite

tiemannite

naumannite

Images

Formula: CuFeSe2
Selenide, chalcopyrite group, and forms a series with chalcopyrite
Crystal System: Tetragonal
Specific gravity: 5.35 measured, 5.44 calculated
Hardness: 3 to 3½
Streak: Black
Colour: Brass yellow
Magnetism: Distinctly magnetic
Environments

Hydrothermal environments

Eskebornite occurs in low-temperature hydrothermal vein deposits. Associated minerals include chalcopyrite, clausthalite, tiemannite, berzelianite, naumannite, umangite, geffroyite, chaméanite, uraninite, ankerite and dolomite (HOM).

Localities

At the Eagle Claims U-Cu-Se occurrence, and at the Martin Lake mine, both at the Beaverlodge Lake area, Saskatchewan, Canada, eskebornite occurs as island remnants in, and replaced by, umangite. The remnants range up to 200 microns in diameter and frequently contain small inclusions of eucairite. Other minerals identified in the sections, although not in contact with the eskebornite, are hematite, klockmannite, clausthalite and tyrrellite. The minerals occur in pitchblende ore and in hematite-stained carbonate vein material in the basalt of the Martin formation and in granitised mafic rocks of the chlorite-epidote type of the Eagle group (CM 10.787-796).

The type locality is the Eskaborn Adit, Tilkerode Mining District, Mansfeld, Mansfeld-Südharz, Saxony-Anhalt, Germany.

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