kirschsteinite

…structure are called glaucochroite and kirschsteinite, respectively; these minerals have physical properties similar to monticellite and vary only slightly from their ideal compositions. Glaucochroite has been reported in ore deposits at Franklin, N.J., in the United States; kirschsteinite occurs in slags.

Pure kirschsteinite is known only from slags and has not yet been observed as part of a natural mineral assemblage. The most plausible natural environments for kirschsteinite are altered limestones; it is possible the mineral has remained unrecognized in such rocks because its optical properties (the…