"' Syngenite "'is an uncommon potassium calcium sulfate mineral with formula K 2 Ca ( SO 4 ) 2 �H 2 O . It forms as prismatic monoclinic crystals and as encrustations.
2.
It occurs associated with thenardite, jarosite, sylvite and hematite in fumaroles; with blodite, syngenite, mirabilite, picromerite, borax and halite in evaporites; and with syngenite, whitlockite, monetite, niter and gypsum in guano deposits.
3.
It occurs associated with thenardite, jarosite, sylvite and hematite in fumaroles; with blodite, syngenite, mirabilite, picromerite, borax and halite in evaporites; and with syngenite, whitlockite, monetite, niter and gypsum in guano deposits.