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Derriksite

Field	Value
name	Derriksite
image	Derriksite-Malachite-201073.jpg
imagesize	260px
caption	Crystals of copper-uranium-selenite derriksite (bottle green) on a bed of malachite, the matrix is selenium-rich digenite
category	Oxide minerals
formula	Cu4(UO2)(SeO3)2(OH)6•H2O
IMAsymbol	Drk
strunz	4.JG.30
system	Orthorhombic
class	Pyramidal (mm2)
H-M symbol: (mm2)
symmetry	Pn21m
colour	Bottle green, green
cleavage	{???} perfect, {010} good
diaphaneity	Translucent
gravity	4.72
other	[[Image:Radioactive.svg	25px]] Radioactive

H-M symbol: (mm2) | length fast/slow =

Derriksite is a very rare uranium mineral with the chemical formula Cu4(UO2)(SeO3)2(OH)6•H2O. It is a secondary mineral that contains copper, uranium and the rarer selenium. It is a bright green to duller bottle green colour. Its crystal habit is acicular, it is most likely to be found along with the uranyl selenium mineral demesmaekerite, but derriksite is much rarer than demesmaekerite. It is named after Jean Marie Francois Joseph Derriks (1912–1992), geologist and administrator of the Union Minière du Haut Katanga (UMHK). It has a Mohs hardness of about 2.

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
"Derriksite". [[mindat.org]].

Info: Wikipedia Source

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uranium(vi)-minerals selenite-minerals copper(ii)-minerals hydroxide-minerals orthorhombic-minerals minerals-in-space-group-31 minerals-described-in-1971

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