Ussingite

Ussingite
Ussingite
	Ussingite from Shkatulka pegmatite, Umbozero mine (Umbozerskii mine), Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General
Category	Phyllosilicate minerals
Formula	Na2AlSi3O8OH
IMA symbol	Usg
Strunz classification	9.EH.20
Crystal system	Triclinic
Crystal class	Pinacoidal (1) ; (same H-M symbol)
Space group	P1
Identification
Color	pale to medium violet, reddish violet; sometimes barely tinted purple
Fracture	irregular/ uneven
Tenacity	brittle
Mohs scale hardness	6–7
Luster	sub-vitreous
Streak	white
Diaphaneity	transparent, translucent
References

Last updated August 18, 2025

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

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

References

↑ 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.
↑ Mindat.org Mindat
↑ Webmineral.com Webmineral data
↑ "Handbook of Mineralogy (HOM – MSA) – Ussingite" (PDF). Archived from the original (PDF) on 2021-03-05. Retrieved 2013-01-25.

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[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.

[Mindat-2] Mindat.org Mindat

[Webmin-3] Webmineral.com Webmineral data

[4] "Handbook of Mineralogy (HOM – MSA) – Ussingite" (PDF). Archived from the original (PDF) on 2021-03-05. Retrieved 2013-01-25.

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