Wiktionary
natrophilite
n. (context mineralogy English) An orthorhombic-dipyramidal yellow mineral containing manganese, oxygen, phosphorus, and sodium.
Wikipedia
Natrophilite
Natrophilite is a mineral with the chemical formula Na Mn P O. In a pure form it has a yellow coloration. Its crystals are orthorhombic to dipyramidal. It is transparent to translucent. It is not radioactive. Natrophilite is rated 4.5 to 5 on the Mohs Scale.