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Formula: Ca(IO3)2.H2O
Hydrated iodate
Crystal system: Monoclinic
Specific gravity: 4.24 measured, 4.244 calculated
Hardness: 3½
Colour: Colourless to bright yellow
Solubility: Slowly soluble in cold water, readily soluble in hot water
Environments
Brüggenite dehydrates to lautarite at 220 to 325oC
(Mindat).
Localities
At the type locality, Pampa del Pique III, Oficina Lautaro, Taltal, Antofagasta Province, Antofagasta, Chile,
brüggenite occurs in radiating clusters and long columnar anhedral crystals, in veins with
nitratine and impregnating the enclosing decomposing
rhyolite tuff, in a small
basin filled with nitrate caliche.
Associated minerals include nitratine,
anhydrite, lautarite,
hydroboracite and halite
(HOM, Mindat).
Brüggenite from Pampa del Pique III -
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