Sussexite is a manganese borate mineral MnBO2(OH).

Crystals are monoclinic prismatic and typically fibrous in occurrence.

[3] It is named after the Franklin Mining District in Sussex County, New Jersey, US where it was first discovered in 1868.

Sussexite also occurs in France, Italy, Namibia, North Korea, South Africa, Switzerland, and the US states of Michigan, New Jersey, Utah and Virginia.

This article about a specific mineral or mineraloid is a stub.