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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
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.
Eskebornite from the Eskaborn Adit -
Image
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