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Formula: Zn2Mn2+(SiO4)(OH)2
Nesosilicate (insular SiO4 groups), manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.06 to 4.08 measured, 4.07 calculated
Hardness: 4½ to 5
Colour: Light pink, Orange, Reddish brown.
Common impurities: Fe,Mg,Ca
Environments
There are two co-type localities, the Franklin Mine, and the Hamburg Mine, both at Franklin, Franklin Mining District, Sussex county,
New Jersey, USA.
Hodgkinsonite is known only from these localities to date (October 2020). It is found as seams in massive
willemite-franklinite granular ore in a
metamorphosed zinc-manganese deposit.
Associated minerals include baryte, willemite,
franklinite, tephroite,
pyrochroite, calcite,
manganoan
garnet and copper
(HOM, FM 38396).
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