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Natural cummingtonite encompasses virtually the entire compositional range from Mg to Fe end-member. It occurs in several metamorphic rock types, but predominantly in amphibolites and metaironstones. Most examples were produced under amphibolite-facies conditions, although the full range for cummingtonite is at least 400-800 °C and &lt; 1-15 kbar. Cummingtonite is also a critical indicator of T, a H₂O ,and f O₂  in silicic volcanic rocks from shallow magma chambers.

Thermodynamics and petrology of cummingtonite