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Formula: CaCu2+Al(AsO4)2(OH)(H2O)
Arsenate, tsumcorite group
Crystal System: Triclinic
Specific gravity: 4.094 calculated for the empirical formula, 4.085 calculated for the ideal formula
Hardness: 3½
Streak: White
Colour: Apple-green
Luminescence: Does not fluoresce with LW or SW UV.
Solubility: Insoluble at room temperature in concentrated hydrochloric or sulphuric acid
Environments
Alumolukrahnite is a new mineral, approved in 2022 and to date (August 2023) it has been reported only from
the type locality.
Localities
At the type locality, the Jote Mine, Pampa Larga mining district, Tierra Amarilla, Copiapó Province, Atacama,
Chile, alumolukrahnite was found as a secondary
alteration phase
associated with conichalcite,
coronadite, gypsum,
olivenite,
pharmacosiderite,
rruffite and scorodite.
Alumolukrahnite occurs as crude diamond-shaped tablets up to ~0.1 mm in size, intergrown in crude spherical
aggregates. Crystals are apple-green and transparent to translucent, with vitreous lustre and a white streak
(MM 87.465-469).
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