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Rameauite

Field	Value
name	Rameauite
category	Oxide mineral
formula	K2Ca(UO2)6(OH)16·H2O or K2CaU6+6O20·9H2O
IMAsymbol	Rme
molweight	2,028.57 g/mol
strunz	4.GB.05
system	Monoclinic
class	Prismatic (2/m)
(same H-M symbol)
symmetry	C2/c
unit cell	a= 13.97 Å, b= 14.26 Å
c= 14.22 Å, β = 121.02°: Z = 4
color	Orange
habit	Prismatic and/or can consist of a hexagonal outline
twinning	On {100}
cleavage	Good cleavage
refractive	a= n.d. β= 1.95 γ= 1.97
opticalprop	Biaxial Negative
2V	32° (meas.)
density	5.6
diaphaneity	Semitransparent
other	[[Image:Radioactive.svg	25px]] Radioactive
references

(same H-M symbol) c= 14.22 Å, β = 121.02°: Z = 4 Rameauite is a hydrated complex uranyl oxide mineral with formula K2Ca(UO2)6(OH)16·H2O

Crystallography

Rameauite has four observed forms which are {010}, {100}, {001} and {110}. The angles between these faces are {100}^{001} = 58°40' and {010}^{110} = 49° 50'. The crystals are always twinned on {100} and they are flattened parallel to {010}, and elongated parallel to {001}. The mineral rameauite is an example of a monoclinic mineral and appears pseudo-hexagonal. I has unit cell dimensions of: a= 13.97, b= 14.26, c= 14.22 with β = 121.02°.

Occurrence

It was first described in 1972 for an occurrence in the Margnac Mine, Compreignac, Haute-Vienne, Limousin, France and named after Jacques Rameau (1926–1960), French prospector at the "Commissariat à l'Energie Atomique", who discovered the deposit where the mineral occurs. In addition to the type locality in France it has been reported from the Orphan Mine on the south rim of the Grand Canyon in Arizona and on Rhyolite Ridge, Esmeralda County, Nevada.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
"Rameauite Mineral Data".
"ATHENA - Pierre Perroud".
or K₂CaU⁶⁺₆O₂₀·9H₂O.[http://rruff.geo.arizona.edu/doclib/hom/rameauite.pdf Handbook of Mineralogy]
[http://rruff.geo.arizona.edu/doclib/mm/vol38/MM38_781.pdf Cesbron, F., W.L. Brown, P. Bariand, and J. Geffroy (1972) Rameauite and agrinierite, two new hydrated complex uranyl oxides from Margnac, France. Mineralogical Magazine, 38, 781–789.]

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.

oxide-minerals uranium(vi)-minerals monoclinic-minerals minerals-in-space-group-15 potassium-minerals

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