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Coconinoite

Uranium ore

Summary

Uranium ore

Field	Value
name	Coconinoite
category	Phosphate minerals
image	Coconinoite.jpg
caption	Coconinoite on a sandstone matrix
formula	Fe3+2Al2(UO2)2(PO4)4(SO4)(OH)2•20(H2O)
IMAsymbol	Coc
molweight	489.01 gram/mol
strunz	8.EB.35
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/c
unit cell	a = 12.45(6) Å, b = 12.96(3) Å,
c = 17.22(5) Å; β = 105.7°; Z = 4
color	Pale creamy yellow
habit	As lathlike to platy grains, in microcrystalline aggregates seams and crusts.
mohs	1-2
luster	Adamantine - pearly
refractive	nα = 1.550 nβ = 1.588 nγ = 1.590
opticalprop	Biaxial (-)
birefringence	δ = 0.040
pleochroism	X = colorless; Y = Z = pale yellow. Orientation: Y = elongation of laths with positive elongation; Y at 8°-25° to elongation of laths with negative elongation.
2V	Measured: 28° to 43°, Calculated: 24°
streak	White
gravity	2.70
diaphaneity	Translucent
other	[[Image:Radioactive.svg	25px]] Radioactive
references

(same H-M symbol) c = 17.22(5) Å; β = 105.7°; Z = 4

Coconinoite is a uranium ore that was discovered in Coconino County, Arizona. It is a phosphate mineral; or uranyl phosphate mineral along with other subclass uranium U6+ minerals like blatonite, boltwoodite, metazeunerite and rutherfordine.

Composition

The chemical formula is Fe2Al2(UO2)2(PO4)4(SO4)(OH)2·20H2O. The chemical formula was derived from the spectrographic analysis.

Physical properties

The mineral has a white streak and a pale creamy yellow color. The mineral occurs as microscopic crystals, the largest found is 6 by 20 micrometers. It is a radioactive mineral, but not fluorescent. Upon heating for dehydration it is found that the mineral loses some of its SO2 at 600 to 800 °C.

Geologic occurrence

It occurs in the oxidized zone of vanadium-poor Colorado Plateau-type uranium deposits of Utah and Arizona. It occurs in association with gypsum, jarosite, limonite, quartz, clay minerals and coalized wood at the Jomac mine, Utah.

Coconinite was first described in 1966 for occurrences in the Huskon Mines, Cameron, Cameron District and the Sun Valley Mine, Vermillion Cliffs District, Coconino County, Arizona. It was named for Coconino County.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://webmineral.com/data/Coconinoite.shtml Webmineral data]
[http://www.mindat.org/min-1102.html Mindat.org]
"Handbook of Mineralogy".
Young.E, Weeks, A.D, and Merowitz, R. (1996) Coconinoite a new mineral from Utah and Arizona. The American Mineralogist 51, 651-663

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

iron(iii)-minerals aluminium-minerals uranium(vi)-minerals phosphate-minerals monoclinic-minerals minerals-in-space-group-15

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