Besides the obvious greenish feldspar, the countertop rock is composed of black pyroxene, gray metallic minerals (magnetite or ilmenite are likely, but I didn't bring my magnet, magnetometer, or portable xrf), and pyrite. Also see:
Geo-beers: Gimme an Icky
Anorthosite and labradorescence
Theme and Variations on Anorthosite and Labradorescence
Rock 366 : Day 72 : Anorthosite with sulphides
Labradorite at Wikipedia (photo)
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