Deliensite
Deliensite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Fe²⁺(UO₂)₂(SO₄)₂(OH)₂·7H₂O.
It crystallizes in the orthorhombic crystal system (space group Pnn2).
Key properties: Mohs hardness 2; specific gravity 3.268; White streak; Vitreous luster; optically biaxial.
IMA symbol Dli, IMA status: approved, named in 1996.
A rare mineral found in the oxidized portions of a uranium deposit.
It is found associated with Uraninite, gypsum, pyrite.
The mineral was named to honor Dr. Michel Deliens (1939–), Belgian mineralogist of the Royal Belgian Institute of Natural Sciences, Brussels, Belgium, for his contributions to uranium mineralogy.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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