Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Arfvedsonite from
Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA


02162780017362044579457.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
08126490017272017069722.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
02713800017272017122263.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
04562110017462710209202.jpg
Arfvedsonite

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
02162780017362044579457.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
08126490017272017069722.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
02713800017272017122263.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
09130810017462021816534.jpg
Arfvedsonite

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
06073250017362044577464.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
08126490017272017069722.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
02713800017272017122263.jpg
Arfvedsonite, etc.

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
04562110017462710209202.jpg
Arfvedsonite

Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
Locality type:Pass
Classification
Species:Arfvedsonite
Formula:NaNa2(Fe42+Fe3+)Si8O22(OH)2
Habit:large prisms to 6cm; rock forming masses
Colour:Black
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very common
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Aegirine
Goethite
Microcline
Okanoganite-(Y)
Quartz
Zektzerite
Associated Minerals Based on Photo Data:
Microcline55
Zektzerite37
Albite25
Quartz23
Aegirine12
Pyrochlore Supergroup8
Astrophyllite6
Sogdianite6
Riebeckite4
Zircon4
Bastnäsite Group4
Synchysite Group4
Elpidite4
- var Calcium-bearing Elpidite2
Annite2
Okanoganite-(Y)2
Löllingite2
Bastnäsite-(Ce)2
Fluorite2
Gagarinite-(Y)2
Euxenite-(Y)2
Polylithionite2
Titanite2
Kainosite-(Y)1
Calciocatapleiite1
Siderite1
Biotite1
- var Oxybiotite1
Feldspar Group1
Data
Mineral Data:Click here to view Arfvedsonite data
Locality Data:Click here to view Washington Pass, Golden Horn Batholith, Okanogan County, Washington, USA
Photo GalleryView Gallery (31 photos)
Data Identifiers
Mindat Occurrence Record ID:46432
Long-form Identifier:1:3:46432:3
GUID (UUID V4):0
References
Micro Probe Volume VI Number 8
Rocks and Minerals 66:6, p453
American Mineralogist, V.58, p. 874
Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.49
 
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