Huangite
Huangite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Ca₀.₅Al₃(SO₄)₂(OH)₆.
It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-Alunite structural group.
Key properties: specific gravity 2.8; White streak; Vitreous luster; optically uniaxial.
IMA symbol Hua, IMA status: approved, named in 1991.
A product of acid sulfate hydrothermal alteration of rhyolite tuffs and andesites.
It is found associated with Kaolinite, pyrite, woodhouseite (El Indio mine, Chile); alunite, natroalunite, minamiite (Okumanza, Japan).
The mineral was named to honor Yunhui Huang (1926–), Chinese mineralogist, Institute of Mineral Deposit Geology and Mineral Resources, Beijing, China.
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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