In reply to discussion by E. D. Jackson (Econ. Geol., Vol. 61, p. 777-780, 1966), it is pointed out that Jackson incorrectly equates the silicate inclusions described by McDonald from the Bushveld complex with the 'type 2' inclusions Jackson has described from the Stillwater complex (Montana). His criticisms based on this premise are therefore not valid. Experimental studies on relatively simple systems do not preclude the existence of a spinel-rich immiscible liquid in a more complex natural system.

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