How to spell FARIENTITE correctly?

The misspelling "farientite" could actually be "peridotite". Peridotite is a type of rock that consists mainly of the mineral olivine. It is typically dark green or black, and is found in the Earth's mantle. Another possible suggestion for the misspelling "farientite" could be "fayalite", which is a type of iron-rich mineral commonly found in igneous rocks.