arfvedsonite
Sign in to saveArfvedsonite () or soda hornblende (partiellement obsolète) is a sodium amphibole mineral with composition: [Na][Na2][(Fe2+)4Fe3+][(OH)2|Si8O22]. It crystallizes in the monoclinic prismatic crystal system and typically occurs as greenish black to bluish grey fibrous to radiating or stellate prisms.
Key facts
- Mineral.name
- Arfvedsonite
- Mineral.category
- InosilicatesAmphiboles
- Mineral.image
- Arfvedsonit-167989.jpg
- Mineral.imagesize
- 260px
- Mineral.formula
- [Na][Na2][(Fe2+)4Fe3+][(OH)2
- Mineral.IMAsymbol
- Arf
- Mineral.strunz
- 9.DE.25 (10 ed) VIII/F.08-100 (8 ed)
- Mineral.dana
- 66.1.3c.9
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- C2/m
- Mineral.color
- Black, deep green on thin edges
- Mineral.habit
- Fibrous, radial prismatic aggregates
- Mineral.twinning
- Simple or lamellar parallel to [100]
- Mineral.cleavage
- Perfect on [110]
- Mineral.fracture
- Uneven
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 5–6
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Arfvedsonite () or soda hornblende (partiellement obsolète) is a sodium amphibole mineral with composition: [Na][Na2][(Fe2+)4Fe3+][(OH)2|Si8O22]. It crystallizes in the monoclinic prismatic crystal system and typically occurs as greenish black to bluish grey fibrous to radiating or stellate prisms.
It is a rather rare mineral occurring in nepheline syenite intrusions and agpaitic (peralkaline) pegmatites and granites as the Golden Horn batholith in Okanogan County, Washington (type locality for zektzerite). Occurrences include Mont Saint-Hilaire, Quebec, Canada; the Ilímaussaq complex in Southern Greenland; and in pegmatites of the Kola Peninsula, Russia. Its mineral association includes nepheline, albite, aegirine, riebeckite, katophorite and quartz.