Mineralpedia Details for Barahonaite-(Al)

Named for the relationship to barahonaite-Fe which in turn was named after Antonio Barahona from Spain who was the first to provide specimens for study, and for the aluminum content of the mineral. It is found as a secondary mineral in an oxidized sulfide deposit in association with arsenocrandallite, arsenogoyazite, conichalcite, cobaltarthurite, chlorargyrite, olivenite, azurite, cornwallite, pharmacosiderite, zalesiite, and lavendulan. Localities include at the Dolores prospect near Pastrana in the Murcia province of Spain which is its type locality, and in Chile and the United States.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/barahonaite-(Al).pdf

Formula

(Ca,Cu,Na,Fe³⁺,Al)₁₂Al₂(AsO₄)₈(OH,Cl)_x·nH₂O 

Crystal System

Monoclinic 

Crystal Habit

Tabular 

Luster

Vitreous (Glassy) 

Color

pale blue 

Streak

white 

Class

Monoclinic 

Fracture

Brittle 

Hardness

- 

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Mindat

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Pearly, light green rosettes to about 0.5mm associated with white, cubic Alumopharmacosiderite crystals.

Light blue extremely micro platy crystals in tiny aggregates to about 0.5mm associated with snow white spherules of Arsenogoyazite and bright green Conichalcite.