Nahpoite
Nahpoite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Na₂(PO₃OH).
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: Mohs hardness 1–3; specific gravity 2.6; Dull luster.
IMA symbol Nhp, IMA status: approved, named in 1981.
An alteration product of marićite in nodules in phosphatic ironstone (Yukon Territory, Canada); in sodalite xenoliths in association with an intrusive alkalic gabbro-syenite complex (Mont Saint-Hilaire, Canada).
It is found associated with Marićite (Yukon Territory, Canada); natrophosphate, villiaumite (Kola Peninsula, Russia).
The name refers to the principal chemical components, sodium, NAtrium, Hydrogen, Phosphorus, and Oxygen.
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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