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Arfvedsonite

Sodium amphibole mineral

Field	Value
name	Arfvedsonite
category	Inosilicates
Amphiboles
image	Arfvedsonit-167989.jpg
imagesize	260px
formula	[Na][Na2][(Fe2+)4Fe3+][(OH)2	Si8O22]
IMAsymbol	Arf
strunz	9.DE.25 (10 ed)
VIII/F.08-100 (8 ed)
dana	66.1.3c.9
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/m
color	Black, deep green on thin edges
habit	Fibrous, radial prismatic aggregates
twinning	Simple or lamellar parallel to [100]
cleavage	Perfect on [110]
fracture	Uneven
tenacity	Brittle
mohs	5–6
luster	Vitreous
streak	Deep bluish gray, gray-green
diaphaneity	Translucent to opaque
gravity	3.3–3.5
opticalprop	Biaxial (−)
refractive	nα = 1.652–1.699
nβ = 1.660–1.705
nγ = 1.666–1.708
birefringence	δ = 0.014
pleochroism	Strong: Blue-greens, yellow-browns, gray-violets
dispersion	r v strong
references

Amphiboles VIII/F.08-100 (8 ed) (same H-M symbol) nβ = 1.660–1.705 nγ = 1.666–1.708 | length fast/slow =

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.

Arfvedsonite was discovered in 1823 and named for the Swedish chemist Johan August Arfwedson (1792–1841).

References

Deer, W.A., R.A. Howie, and J. Zussman (1963) Rock-forming Minerals, v. 2, Chain Silicates, p. 364–374
Mineral Galleries

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://rruff.geo.arizona.edu/doclib/hom/arfvedsonite.pdf Arfvedsonite]. Handbook of Mineralogy
[http://www.mindat.org/min-325.html Arfvedsonite]. Mindat.org
[http://webmineral.com/data/Arfvedsonite.shtml Arfvedsonite]. Webmineral
"IMA Master List".
(2003). "The Chambers Dictionary". Chambers.

Info: Wikipedia Source

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