As nouns the difference between marrite and marmite

is that marrite is (mineralogy) a monoclinic-prismatic mineral containing arsenic, lead, silver, and sulfur while marmite is something which people either love or hate.

As a proper noun marmite is

(australia|british|new zealand) a sticky, dark brown, strongly flavoured spread based on a yeast extract (a by-product of beer brewing), eaten on toast, in sandwiches, etc.

As a verb marmite is

to apply marmite to.