Roaldite
General
CategoryMineral
Formula
(repeating unit)
(Fe,Ni)>4N
IMA symbolRoa[1]
Strunz classification1.BC.05
Dana classification1.1.18.2
Crystal systemCubic
Crystal classHextetrahedral (43m)
H–M Symbol: (4 3m)
Space groupP43m (no. 215)
Unit cella = 3.79 Å; Z = 1
Identification
ColourTin-white
Crystal habitPlatelets in kamacite
Mohs scale hardness5.5-6.5
LustreMetallic
DiaphaneityOpaque
Specific gravity7.21
Optical propertiesIsotropic
References[2][3]

Roaldite is a rare meteorite mineral containing iron, nickel and nitrogen. Its chemical formula is (Fe,Ni)4N.

It was first described in 1981 for an occurrence in the Youngedin meteorite, Avon, Western Australia. It was named after Roald Norbach Nielsen (born 1928), a Danish expert in electron microprobe. The mineral has also been reported from the Jerslev meteorite, Sjaelland, Denmark, and the Canyon Diablo meteorite of Meteor Crater in Arizona.[2]

See also

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. 1 2 Mindat.org
  3. Webmineral data


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