This lepidolite specimen consists of tiny lepidolite flakes and a quartz matrix whose neutral color does not obscure the characteristic color of the mica. Lepidolite can also be pink, yellow or gray.
One notable occurrence of lepidolite is in greisens, bodies of granite that are altered by fluorine-bearing vapors. That's what this may be, but it came from a rock shop with no data on its origin. Where it occurs in larger lumps in pegmatite bodies, lepidolite is an ore of lithium, especially in combination with the other lithium minerals tourmaline and spodumene.