The Nitre Ore is an ore added in AbyssalCraft. It generates randomly in The Overworld.
This block can't be crafted.
When mined, the Nitre Ore drops 1 - 4 Nitre.
World Generation Edit
The Nitre Ore generates across all biomes in The Overworld at ground level 30 and below
Nitre can be used to create gunpowder (along with sulfur and charcoal). It's main usage is Crystallization, where you can harvest Potassium (and Nitrate) from it.