Fluorapophyllite-(NH4)
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(NH4)Ca4(Si8O20)F·8H2O
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Fluorapophyllite-(NH4) is an ammonium-dominant member of the apophyllite group, a phyllosilicate mineral crystallizing in the tetragonal system as colorless to white square prismatic crystals with a characteristic vitreous to pearly luster. It occurs in hydrothermal veins and as a secondary mineral in guano-enriched cave or fumarolic environments where ammonium is available. The mineral is of scientific interest for documenting ammonium substitution in the apophyllite structure.