Ammoniotinsleyite

ammoniotinsleyite

halite

gypsum

salammoniac

Images

Formula: (NH₄)Al₂(PO₄)₂(OH).2H₂O
Phosphate, leucophosphite group
Crystal System: Monoclinic
Specific gravity: 2.42 measured, 2.451 calculated
Hardness: 4
Streak: White
Colour: Pink to pale violet
Environments

Cave deposits

Ammoniotinsleyite is a relatively new mineral, approved in 2019 and to date (May 2023) reported only from the type locality.

Localities

At the type locality, Pabellón de Pica, Chanabaya, Iquique Province, Tarapacá, Chile, ammoniotinsleyite is found in a guano deposit. Associated minerals include halite, gypsum, salammoniac and clay minerals. Ammoniotinsleyite occurs as pink to pale violet globular aggregates up to 3 mm across, with individual single crystals ~10 to 15 μm (MM 84.5.705-711).

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