MAC Formidable is a moderately warm-toned, duochrome with a very dark plum base and shift between teal, plum paired with a pearl finish. It is a permanent nail lacquer that retails for $12.00 and contains 0.34 oz.
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MAC Formidable Studio Nail Lacquer ($12.00 for 0.34 fl. oz.) is described as a "teal green with pink multi-changing pearl [with a Pearl finish]." It's a plummy purple base with iridescent shimmer that shifts from bluish-teal to fiery pink-plum. It's semi-opaque after two coats (it's really a three-coater, if you want nice results). The shimmer/pearl disperses fairly evenly, and it dries down to a lightly glossy finish. It had a slightly thinner consistency, but it didn't pool along the edges or seem watery. Orly Galaxy Girl is very similar (thanks for the reminders!).