White veins of gypsum and glittering mica sparkled in the moonlight along its bare edges.

The walls and floors had been polished, bringing out the natural colors of the granite and glittering mica striations.

I think it is nothing but a lot of granite rubbish and nasty glittering mica that isn't worth ten cents an acre!

The peak itself was torn and shattered, so that it revealed great gleaming surfaces and pits, in which glittered mica, or some other mineral.