Hagendorfite

Hagendorfite is an iron phosphate mineral with the chemical formula of (Na,Ca)MnFe₂(PO₄)₃ and is named after where the mineral was discovered, Hagendorf-Süd, Bavaria, Germany.

Hagendorfite is in the monoclinic crystal class; the mineral's internal symmetry consists of three axes with unequal length. Furthermore, the angles between two of the axes is 90° while the other angle is less than 90°. Monoclinic minerals contain a twofold rotation axis where they can be rotated 360° and have the crystal face repeat every 180°. They also have the characteristic mirror plane, which can produce a perfect mirror image when divided in two.