Mineral Structure Data
The Humite group is composed of minerals of the general formula (Mg,Fe)2x+1(SiO4)x(F,OH)2 where x = 1 (norbergite), 2 (chondrodite), 3 (humite), and 4 (clinohumite). In natural samples Mg>>FE and F>>OH. The principal occurrence is in high grade metamorphosed mafic and ultramafic rocks.
The crystal structure of humite.
The crystal structure of clinohumite.
End-Member Norbergite Chondrodite Humite Clinohumite Formula (Mg,Fe)3SiO4(F,OH)2 (Mg,Fe)5(SiO4)2(F,OH)2 (Mg,Fe)7(SiO4)3(F,OH)2 (Mg,Fe)9(SiO4)4(F,OH)2
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