Hügelite
Hügelite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Pb₂(UO₂)₃(AsO₄)₂O₂·5H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: Mohs hardness 2.5; specific gravity 5.1; Pale yellow streak; Greasy to adamantine luster; optically biaxial.
IMA symbol Hüg, grandfathered status — known before the IMA’s founding, named in 1913.
Found as a rare secondary mineral in cavities in hornstone breccia.
It is found associated with Hallimondite, widenmannite, zeunerite, mimetite, cerussite.
The mineral was named to honor Baron Friedrich von Hügel (1852–1925), Austrian-British theologian.
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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