Huizingite-(Al)

huizingite-(Al)

carlsonite

boussingaultite

mascagnite

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Formula: (NH₄)₉Al₃(SO₄)₈(OH)₂.4H₂O
Hydrated sulphate containing hydroxyl
Crystal System: Triclinic
Specific gravity: 2.026 calculated
Hardness: 2½
Streak: White
Colour: light greenish-yellow
Solubility: Easily soluble in water
Common impurities: Fe³⁺
Environments

Fumeroles
Coal-seam fires

Huizingite-(Al) is a relatively new mineral, approved in 2015.

Localities

At the type locality, the Huron Shale burn site, Huron River, Huron County, Ohio, USA, the new minerals carlsonite and huizingite-(Al) formed from a natural fire in the oil-bearing shale. Huizingite-(Al) crystals, typically intergrown in light greenish yellow drusy aggregates, are tabular to bladed, with a white streak and vitreous lustre (AM 101.2095-2107).
Associated minerals include adranosite, anhydrite, boussingaultite, mascagnite and salammoniac (HOM).

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