Abstract

The mineral norbergite recently described by Geijer1 is an abundant mineral in many museums, as most of the minerals labelled chondrodite or humite from Franklin, N. J., are norbergite. All such specimens examined in the Harvard Collections proved to be at least in part norbergite. The norbergite occurs in a coarsely crystalline limestone from the Nicoll Quarry, and grains or crystals are commonly several millimeters across and some are a decimeter across. For the most part crystal faces are entirely lacking, but one crystal suitable for measurement was contained in the Harvard Collection to which it had been presented by Dr. H. Ungemach of Paris in 1906.

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