Mineral/rock

Derived from or for

Nahcolite

acronym of Na, H, C, O plus Greek lithos = stone

Natrolite (zeolite)

Latin natrium or Greek natron = native soda plus lithos = stone

Natron

Latin natrium or Greek nitron = native soda

Neodymium

Greek neos = new and didymos = twin

Nepheline 

Greek nephele = cloud alluding to the cloudy appearance developed on immersing nepheline in strong acid

Nephrite

Latin lapis nephriticus = kidney stone since it was often worn to remedy diseases of the kidnies

Nesquehonite

Nesquehoning near Lansford, Carbon County, Pennsylvania

Niter/Nitrates

ancient origin: Latin nitrum, the Greek for nitron, the Hebrew nether; perhaps originally from Nitria, a city in Upper Egypt

Nontronite 

locality at Arrondissement of Nontron, near the village of Saint Pardoux, France

Northupite

Charles H. Northup (b. 1861), American grocer and first observer

Novaculite

Latin novacula = razor hone alluding to its use as a sharpening stone

Nsutite

locality at the Nsuta Mine, Ghana