Humite (mineral group)

The humite group is a group of nesosilicates with the general formula.
When A is predominantly magnesium we have the humite subgroup:

The manganese-humite subgroup has members

alleghanyite,
manganhumite,
sonolite,

and the leucophoenicite subgroup has members

Chondrodite is the most common member of the humite group. It may contain Ti up to 9.6%. Chondrodite from Sterling Hill Mine and Franklin Mine contains zinc to 11.5% ZnO and Mn to 36% MnO, and grades to alleghanyite.
The humite minerals commonly alter to serpentine or Mg-rich chlorite and dissolve by weathering, leaving iron oxide residues.