Phosphate, leucophosphite group
Specific gravity: 2.42 measured, 2.451 calculated
Colour: Pink to pale violet
Ammoniotinsleyite is a relatively new mineral, approved in 2019 and to date (May 2022) reported only from the
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 ~10–15 μm (MM 84.5.705-711).
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