The compositions of naturally occurring wollastonite and bustamite show that a narrow composition gap separates these two minerals. Iron-free wollastonite from Franklin, New Jersey, with up to 8.1 percent MnO coexists with bustamite with 12.3 percent MnO and 0.7 percent FeO. The maximum iron content found in wollastonite is 2.23 percent FeO in a specimen from Scawt Hill, Ireland. The limiting composition recorded for ferrobustamite is 9.29 percent FeO, 1.22 percent MnO, and 38.86 percent CaO in a specimen from Skye, Scotland.

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