Rahul Sharma (Editor)

Humite (mineral group)

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The humite group 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:

  • 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, (Mn2+)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.

    References

    Humite (mineral group) Wikipedia
    (Text) CC BY-SA


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