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Humite-group minerals are common in the Franklin Marble. The most dominant of the species are norbergite and chondrodite; manganoan humite and manganoan clinohumite are much less common. Manganoan chondrodite, manganoan humite, and manganoan clinohumite have also been found in the orebodies.
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| Table 1. Chemical analyses of minerals in the olivine-, humite-, and manganese-humite groups. | ||
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The in situ and geochemical relations of the humites at Franklin, Sterling Hill, and in the Franklin Marble have not been studied in detail. The locally occurring members of the humite group and related species are listed below. Crystallographic data for the humite group, manganese-humite group, and the leucophoenicite group are given in the Taylor-West orientation as suggested by Jones (1969). Instead of employing alphabetical order within the group, as is done elsewhere in this work, these minerals are presented in order of their M:Si ratios.
Members of the humite, manganese-humite, and leucophoenicite groups.
M 2+:Si Humites Mn-humites Leucophoenicites 3:1 norbergite unknown unknown 5:2 chondrodite alleghanyite ribbeite* 7:3 humite manganhumite leucophoenicite 9:4 clinohumite sonolite jerrygibbsite * Has not been found within the Franklin-Sterling Hill area.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
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