By far, the most common member of the olivine group is the Mn-dominant species tephroite; it is a common constituent of the primary high- temperature ores at both deposits.




	Table 1. Chemical analyses of minerals in the olivine-, humite-, and manganese-humite groups.

Fayalite, occurring at both deposits, is more sparse, in keeping with the low number of Fe-silicates at both Franklin and Sterling Hill. Forsterite is exceedingly rare; only two assemblages are known, both of which are from Sterling Hill.

Glaucochroite is the only calcium olivine here; it is locally common at Franklin, and it is unknown from Sterling Hill.

The minerals of the olivine group which occur at Franklin and/or Sterling Hill are:

Fayalite

Forsterite

Tephroite

Glaucochroite

FOOTER LBI




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