The humite group[1] is a group of nesosilicates with the general formula An(SiO4)m(F,OH)2.
When A is predominantly magnesium we have the humite subgroup: The manganese-humite subgroup has members and the leucophoenicite subgroup has members Chondrodite is the most common member of the humite group.
It may contain Ti up to 9.6% TiO2.
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.