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Formula: (NH4)2Fe3+Cl5.H2O
Hydrated chloride
Crystal System: Orthorhombic
Specific gravity: 2.175 measured, 2.13 calculated
Colour: Ruby-red to red, brownish red
Solubility: Readily soluble in water. Very deliquescent; in humid air it will quickly turn into a deep-yellow
solution; survives only under favourable ambient conditions
(Mindat).
Environments
Localities
At the type locality, Mount Vesuvius, Metropolitan City of Naples, Campania, Italy, kremersite occurs in
active fumeroles, associated with erythrosiderite,
molysite and hematite
(HOM).
At the Marcel mine heap, Radlin, Wodzisław County, Silesian Voivodeship, Poland, relatively large, deep red crystals of
kremersite, up to about 3 mm in size, were found coalesced in a single block from the burning heap
(Mindat).
At the Klyuchevsk Stratovolcano, Ust-Kamchatsky District, Kamchatka Krai, Russia, kremersite is associated with
erythrosiderite
(HOM).
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