Natrophilite

Natrophilite is a mineral with the chemical formula NaMnPO₄. 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.

Natrophilite
Natrophilite, as thin coatings and fracture fillings, from Branchville, Redding, Fairfield County, Connecticut, US
General
Category	Phosphate mineral
Formula	NaMnPO4
IMA symbol	Ntp[1]
Strunz classification	8.AB.10
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)
Space group	Pnam
Identification
Color	Deep yellow to light yellow
Cleavage	Distinct/ good
Fracture	Irregular/ uneven
Tenacity	Brittle
Mohs scale hardness	4+1⁄2 – 5
Luster	Sub-vitreous, greasy
Streak	White
Diaphaneity	Transparent, translucent
Specific gravity	3.41 g/cm3