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Ussingite

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Ussingite
Ussingite from Shkatulka pegmatite, Umbozero mine (Umbozerskii mine), Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General
CategoryPhyllosilicate minerals
Formula
(repeating unit)		Na2AlSi3O8OH
IMA symbolUsg
Strunz classification9.EH.20
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Identification
Colorpale to medium violet, reddish violet; sometimes barely tinted purple
Fractureirregular/ uneven
Tenacitybrittle
Mohs scale hardness6–7
Lustersub-vitreous
Streakwhite
Diaphaneitytransparent, translucent
References

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

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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