It occurs in association with halite and arcanite in salt deposits; and with biphosphammite, aphthitalite, monetite, whitlockite, uricite, brushite and gypsum in cave environments.
2.
For solutions with more than 90 % proportion MgSO 4, hexahydrite ( MgSO 4.6H 2 O ) crystallises preferentially, and below 60 %, arcanite ( K 2 SO 4 ) forms.
3.
Arcanite was first described in 1845 for an occurrence in old pine railroad ties in the Santa Ana tin mine, Trabuco Canyon, Santa Ana Mountains, Orange County, California, US . It has also been reported from hydrothermal deposits in the Cesano geothermal field, Latium, Italy; in bat guano on the Chincha Islands of Peru; and in caves in Western Australia, South Africa and Namibia.
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