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Formula: Ca(IO3)2
Normal iodate
Crystal System: Monoclinic
Specific gravity: 4.59 measured, 4.48 calculated
Hardness: 3½ to 4
Streak: White
Colour: Colourless, yellowish
Solubility: Slightly soluble in water. Readily soluble in hydrochloric acid with evolution of chlorine
Environments
Lautarite occurs coating fractures or embedded in gypsum in nitrate
deposits. Associated minerals include gypsum,
brüggenite, dietzeite,
nitratine, anhydrite,
hydroboracite and halite
(HOM).
Localities
At the type locality, Pampa del Pique III, Oficina Lautaro, Taltal, Antofagasta Province, Antofagasta, Chile,
lautarite occurs in sedimentary nitrate deposits as crystals coating fractures or embedded in
gypsum bands
(Dana).
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