This is a nice purple striped agate pendant, shaped like a leaf. It comes with a nice silver-over-pewter bail and an 18" necklace.

This stone is indeed banded or striped agate, but it has been dyed in order to obtain the unusual coloration. These come in many variations and are indeed striking.

Striped agate is a translucent, banded, often colorful variety of chalcedony (quartz). Very popular for both collectors and lovers of jewelry.