Humite (mineral group)

The humite group is a group of nesosilicates with the general formula A_{n}(SiO4)_{m}(F,OH)2.

When A is predominantly magnesium we have the humite subgroup:
 * norbergite, Mg3(SiO4)(F,OH)2
 * chondrodite, (Mg,Fe,Ti)5(SiO4)2(F,OH,O)2
 * humite, (Mg,Fe)7(SiO4)3(F,OH)2
 * clinohumite, (Mg,Fe)9(SiO4)4(F,OH)2

The manganese-humite subgroup has members
 * alleghanyite, (Mn(2+))5(SiO4)2(OH,F)2
 * manganhumite, (Mn,Mg)7(SiO4)3(OH)2
 * sonolite, Mn9(SiO4)4(F,OH)2

and the leucophoenicite subgroup has members
 * ribbeite, Mn5(SiO4)2(OH)2
 * leucophoenicite, (Mn,Ca,Mg,Zn)(SiO4)3(OH)2
 * jerrygibbsite (Mn,Zn)9(SiO4)4(OH)2

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.