Hodgkinsonite is a rare zinc manganese silicate mineral Zn<sub>2</sub>MnSiO<sub>4</sub>(OH)<sub>2</sub>. It crystallizes in the monoclinic system and typically forms radiating to acicular prismatic crystals with variable color from pink, yellow-red to deep red. Hodgkinsonite was discovered in 1913 by H. H. Hodgkinson, for whom it is named in Franklin, New Jersey, and it is only found in that area.