Eskebornite

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Eskebornite
General
Category Category:Selenide minerals
Formula
(repeating unit)
CuFeSe2
IMA symbol Ebn [1]
Strunz classification 2.CB.10a
Dana classification2.9.1.2
Crystal class Tetragonal
Identification
ColorBrassy yellow
Crystal habit Thick tabular crystals, massive
Cleavage {001} perfect
Mohs scale hardness3–3.5
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 impuritiesAg, S
Other characteristicsDistinctly magnetic
References

Eskebornite is a selenide mineral with the formula Cu Fe Se 2. [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]

Contents

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

Related Research Articles

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<span class="mw-page-title-main">Germanite</span>

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<span class="mw-page-title-main">Bornite</span> Sulfide mineral

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<span class="mw-page-title-main">Pyrrhotite</span> Magnetic iron sulfide mineral

Pyrrhotite is an iron sulfide mineral with the formula Fe(1-x)S. It is a nonstoichiometric variant of FeS, the mineral known as troilite. Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic. The magnetism decreases as the iron content decreases, and troilite is non-magnetic. Pyrrhotite is generally tabular and brassy/bronze in color with a metallic luster. The mineral occurs with mafic igneous rocks like norites, and may form from pyrite during metamorphic processes. Pyrrhotite is associated and mined with other sulfide minerals like pentlandite, pyrite, chalcopyrite, and magnetite, and has been found globally.

<span class="mw-page-title-main">Cobaltite</span> Sulfide mineral composed of cobalt, arsenic, and sulfur

Cobaltite is a sulfide mineral composed of cobalt, arsenic, and sulfur, CoAsS. It naturally appears in the form of a tetartoid, a form of dodecahedron with chiral tetrahedral symmetry. Its impurities may contain up to 10% iron and variable amounts of nickel. Structurally, it resembles pyrite (FeS2) with one of the sulfur atoms replaced by an arsenic atom.

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Clausthalite is a lead selenide mineral, PbSe. It forms a solid solution series with galena PbS.

<span class="mw-page-title-main">Digenite</span> Copper sulfide mineral

Digenite is a copper sulfide mineral with formula: Cu9S5. Digenite is a black to dark blue opaque mineral that crystallizes with a trigonal–hexagonal scalenohedral structure. In habit it is usually massive, but does often show pseudo-cubic forms. It has poor to indistinct cleavage and a brittle fracture. It has a Mohs hardness of 2.5 to 3 and a specific gravity of 5.6. It is found in copper sulfide deposits of both primary and supergene occurrences. It is typically associated with and often intergrown with chalcocite, covellite, djurleite, bornite, chalcopyrite and pyrite. The type locality is Sangerhausen, Thuringia, Germany, in copper slate deposits.

<span class="mw-page-title-main">Carrollite</span> Mineral

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<span class="mw-page-title-main">Temagamite</span>

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Anandite is a rare phyllosilicate with formula (Ba,K)(Fe2+,Mg)3(Si,Al,Fe)4O10(S,OH)2. It crystallizes in the monoclinic crystal system. It is black in color with a glassy luster and a near perfect cleavage.

<span class="mw-page-title-main">Athabascaite</span>

Athabascaite is a member of the copper selenide minerals, and forms with other copper selenides. It was first discovered by S. Kaiman in 1949 while he was researching radioactive materials around Lake Athabasca. Kaiman was conducting research near Uranium City, Saskatchewan where mass amounts of uranium mines were present.

Jolliffeite is a rare selenide mineral with formula NiAsSe or (Ni,Co)AsSe. It is the selenium analogue of the sulfide mineral gersdorffite, NiAsS, with a common impurity of cobalt, CoAsSe. It is named for its discoverer, Alfred Jolliffe, (1907–1988), a Canadian geologist of Queen's University, Kingston, Ontario.

<span class="mw-page-title-main">Chanabayaite</span>

Chanabayaite is the first recognized triazolate mineral, having the formula Cu
2
(N
3
C
2
H
2
Cl
4
.

<span class="mw-page-title-main">Kruťaite</span>

Kruťaite, simplified Krut'aite or krutaite, is a rare mineral with the formula CuSe2. It crystallises in the cubic crystal system. It is part of the pyrite group, being composed of Cu2+ ions and Se22− ions. The mineral is most often found as a dark grey aggregate consisting of tiny crystals no more than a millimeter in size. The crystals are opaque in any size. It has no industrial use, but it is a prized collector's item.

<span class="mw-page-title-main">Teineite</span>

Teineite is a tellurite mineral with the formula Cu(TeO3). 2 H2O. It has a Mohs hardness of 2.5 and it comes in many different shades of blue, ranging from cerulean blue to bluish-gray. The mineral millsite has the same chemical composition, but crystallizes in the monoclinic system, while teineite crystallizes in the orthorhombic system.

<span class="mw-page-title-main">Trogtalite</span> Sulfide mineral

Trogtalite is a rare selenide mineral with the formula CoSe2. It crystallizes in the cubic system and is part of the pyrite group, consisting of Co2+ and Se22− ions. It has a rose-violet colour and its crystals are opaque. It often occurs as grains. It was thought to be dimorphous with hastite, but this was discredited in 2009. Hastite turned out to be the iron selenide mineral ferroselite. It forms a solid solution series with kruťaite.

<span class="mw-page-title-main">Berzelianite</span>

Berzelianite is a rare copper selenide mineral with the formula Cu2Se. It occurs as thin dendritic crusts or as fine-grained inclusions. It crystallizes in the isometric system, unlike its dimorph, bellidoite, which crystallizes in the tetragonal system. The crystals are opaque and slightly malleable.

<span class="mw-page-title-main">Khinite</span>

Khinite is a rare tellurate mineral with the formula Pb2+Cu2+3TeO6(OH)2. It crystallizes in the orthorhombic system and has a bottle-green colour. It is often found as dipyramidal, curved or corroded crystals no more than 0.15 mm in size. The tetragonal dimorph of khinite is called parakhinite.

<span class="mw-page-title-main">Oosterboschite</span>

Oosterboschite is a rare selenide mineral with the formula (Pd,Cu)7Se5. It crystallises in the orthorhombic crystal system. It has a creamy yellow colour and a Moh's hardness of 5. It is often found as grains with no clear shape. The crystals are opaque and often no bigger than 0.4 mm.

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi: 10.1180/mgm.2021.43 . S2CID   235729616.
  2. "Eskebornite: Eskebornite mineral information and data". www.mindat.org. Retrieved 2016-10-24.
  3. Barthelmy, Dave. "Eskebornite Mineral Data". webmineral.com. Retrieved 2016-10-24.
  4. 1 2 "Handbook of Mineralogy, Eskebornite" (PDF).
  5. "Chalcopyrite-Eskebornite Series: Chalcopyrite-Eskebornite Series mineral information and data". www.mindat.org. Retrieved 2016-10-24.
  6. D.C. Harris, E.A.J. Burke. "Eskebornite, two Canadian occurrences" (PDF). The Canadian Mineralogist. 10: 786–796.