Natropalermoite
Natropalermoite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Na₂SrAl₄(PO₄)₄(OH)₄.
It crystallizes in the orthorhombic crystal system. It is a member of the Carminite structural group.
Key properties: Mohs hardness 5.5; specific gravity 3.502; White streak; Vitreous luster; optically biaxial.
IMA symbol Npl, IMA status: approved, named in 2013.
Found in a complex, phosphate-bearing granitic pegmatite, formed by hydrothermal alteration of primary triphylite pods in the core-margin zone of the pegmatite.
It is found associated with Palermoite, eosphorite, childrenite, lefontite, quartz.
Reflects the presence of sodium (natrium) and the structural isomorphism to palermoite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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