Chemical Formula: Mn Zn2(SiO4)(OH)2
Locality: Franklin, Sussex Co., New Jersey, USA.
Name Origin: Named for H. H. Hodgkinson, assistant underground supervisor of Franklin mine who discovered the mineral.
Hodgkinsonite is a rare zinc manganese silicate mineral Mn Zn2(SiO4)(OH)2. 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.
Diaphaneity: Translucent to subtranslucent to opaque
Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals.
Hardness: 4.5-5 – Near Apatite
Luminescence: Fluorescent, Long UV=red, weak pink dull dark purple.
Luster: Vitreous (Glassy)