In 1930 seamanite, a new manganese phosphoborate was reported from the Chicagon Mine in Iron County, Michigan.1 Associated with the seamanite, but occurring in thin veinlets from 1mm. to 3mm. wide, was a white to yellowish-buff colored mineral which upon subsequent examination was shown to be sussexite. The sussexite occurs in the veinlets as irregular matted masses of fibers with the fibers lying parallel to the plane of the vein. These veins run through both the red “soft ore” hematite and the highly altered and porous cherty gangue. The gangue separates easily from the veins leaving thin sheets of the felted fibers of sussexite. Small cavities or vugs within the veins are lined with yellow, transparent crystals of seamanite and in many instances they are implanted directly upon the sussexite. All the specimens in our possession were collected for the seamanite although the sussexite is by far the more prevalent mineral.

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