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 (repeating unit) | Na2AlSi3O8OH |
| Strunz classification | 9.EH.20 |
| Crystal system | Triclinic |
| Identification | |
| Color | pale to medium violet, reddish violet; sometimes barely tinted purple |
| Crystal symmetry |
Triclinic - pinacoidal H-M symbol: (1) Space group: P1 |
| Fracture | irregular/ uneven |
| Tenacity | brittle |
| Mohs scale hardness | 6-7 |
| Luster | sub-vitreous |
| Streak | white |
| Diaphaneity | transparent, translucent |
| References | [1][2] |
Ussingite is a silicate mineral with formula Na2AlSi3O8(OH).[3]
It was named for Niels Viggo Ussing (1864–1911), Copenhagen, Denmark.
References
This article is issued from Wikipedia - version of the Monday, April 04, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.