Ussingite

(repeating unit)Na2AlSi3O8OHIMA symbolUsg[1]Strunz classification9.EH.20Crystal systemTriclinicCrystal classPinacoidal (1)
(same H-M symbol)Space groupP1IdentificationColorpale to medium violet, reddish violet; sometimes barely tinted purpleFractureirregular/ unevenTenacitybrittleMohs scale hardness6–7Lustersub-vitreousStreakwhiteDiaphaneitytransparent, translucentReferences[2][3]

Ussingite is a silicate mineral with formula Na2AlSi3O8(OH).[4]

It was named for Niels Viggo Ussing (1864–1911), Copenhagen, Denmark.

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. ^ Mindat.org Mindat
  3. ^ Webmineral.com Webmineral data
  4. ^ Handbook of Mineralogy (HOM – MSA) – Ussingite


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