Formula: Fe³⁺₃(As³⁺O₂)₄(As³⁺₂O₅)(OH)

Species:

Specific Gravity: 4.07

Crystal System: Orthorhombic

Name: Named for the type locality.

Type Locality: Karibib Constituency, Erongo Region – Namibia

A rare iron arsenite. So far, it always originated as a weathering product of löllingite. Visually similar to ludlockite.
The structure seems to have been solved just recently . The mineral is unique in being the only arsenite with structurally different anions (chains and dimers simultaneously), and is a representative of a small class of diarsenates(III) (or diarsenites).