Loellingite

(repeating unit)FeAs₂IMA symbolLö^[1]Strunz classification2.EB.15aCrystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPnnmUnit cella = 5.16, b = 5.93
c = 3.05 [Å]; Z = 2IdentificationColorSteel grey to silvery whiteCrystal habitPrismatic to pyramidal crystals, massiveTwinningOn {001}, possibly trillings, polysynthetic on {101}CleavageRare, distinct on {010}, {101}FractureUnevenMohs scale hardness5–5.5LusterMetallicStreakGrayish blackSpecific gravity7.1–7.5Optical propertiesDistinctly anisotropic in reflected lightReferences^[2][3][4]

Loellingite, also spelled löllingite, is an iron arsenide mineral with formula FeAs₂. It is often found associated with arsenopyrite (FeAsS) from which it is hard to distinguish. Cobalt, nickel and sulfur substitute in the structure. The orthorhombic lollingite group includes the nickel iron arsenide rammelsbergite and the cobalt iron arsenide safflorite. Leucopyrite is an old synonym for loellingite.

It forms opaque silvery white orthorhombic prismatic crystals often exhibiting crystal twinning. It also occurs in anhedral masses and tarnishes on exposure to air. It has a Mohs hardness of 5.5 to 6 and a quite high specific gravity of 7.1 to 7.5. It becomes magnetic after heating.

Loellingite was first described in 1845 at the Lölling district in Carinthia, Austria, for which it was named.

It occurs in mesothermal ore deposits associated with skutterudite, native bismuth, nickeline, nickel-skutterudite, siderite and calcite. It has also been reported from pegmatites.^[4]

References

Further reading

• Schumann, Walter (1991). Mineralien aus aller Welt. BLV Bestimmungsbuch (2 ed.). p. 223. ISBN 3-405-14003-X.

External links