Ussingite
Appearance
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 (repeating unit) | Na2AlSi3O8OH |
IMA symbol | Usg[1] |
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 | [2][3] |
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