Häggite
Häggite is an IMA-recognized mineral species in the vanadate class, with the chemical formula V³⁺V⁴⁺O₂(OH)₃.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 4.7; specific gravity 3.51.
IMA symbol Hgg, grandfathered status — known before the IMA’s founding, named in 1958.
Found in the oxidized zone of Colorado Plateau-type U-V deposits.
It is found associated with Doloresite (USA); pyrite, selenium (Russia).
The mineral was named to honor Gunnar Hagg (1903-), chemist and crystallographer, of the University of Uppsala, Uppsala, Sweden.
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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