Minerals in the magnetite deposits

Minable deposits of magnetite are found at several places in the Franklin district, both in the Franklin limestone and in the gneiss, and so intimately associated with the pegmatite bodies that the genetic relation of the two can scarcely be doubted. The minerals composing the iron ores, most of them except magnetite being in small amounts or very locally developed, are magnetite, microcline, leucaugite, epidote, allanite, biotite, phlogopite, scapolite, iron axinite, iron garnet, iron spinel, apatite, pyrite, arsenopyrite, molybdenite, rutile, titanite, and zircon. This grouping of minerals makes highly probable the genetic relations of the magnetite bodies to the pegmatites that is indicated by their geologic relation. The absence of zinc and manganese compounds is also a noteworthy feature of the iron ores, although minute traces of both those metals have been detected in the magnetite. (See appendix, a, page 130.)


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