Eskebornite

Eskebornite is a selenide mineral with the formula CuFeSe₂.^[2][3] It crystallizes in the tetragonal system and it has a brassy colour. Eskebornite is sometimes found as thick tabular crystals, but is more often found intergrown with other selenides.^[4] It is part of the chalcopyrite group and forms a series with chalcopyrite.^[5]

Eskebornite
General
Category	Category:Selenide minerals
Formula	CuFeSe2
IMA symbol	Ebn[1]
Strunz classification	2.CB.10a
Dana classification	2.9.1.2
Crystal class	Tetragonal
Identification
Color	Brassy yellow
Crystal habit	Thick tabular crystals, massive
Cleavage	{001} perfect
Mohs scale hardness	3–3.5
Luster	Metallic
Streak	Black
Diaphaneity	Opaque
Density	5.35 (measured) 5.44 (calculated)
Pleochroism	Creamy yellow to yellowish brown
Ultraviolet fluorescence	None
Solubility	Insoluble
Common impurities	Ag, S
Other characteristics	Distinctly magnetic
References

Occurrence

Eskebornite was first identified in 1949 by Paul Ramdohr in the Eskaborn Adit, Tilkerode (Abberode), Harz, Saxony-Anhalt, Germany,^[6] which it was also named after. It is often found with other selenides, including clausthalite, tiemannite, berzelianite, naumannite, umangite, geffroyite, and chaméanite, but also with other minerals like chalcopyrite, uraninite, ankerite, and dolomite.^[4]

See also

• List of minerals