Purple chalcedony is purple colored cryptocrystalline quartz whose primary source mined in Indonesia by the same folks who mine bumblebee jasper.
First found scattered in stream beds and in farmers fields as they cleared jungle. it has a dark brown skin which hides the internal purples.
Purple chalcedony occurs in banded and multi-episodic sheered veins in other colors from blue to brown in low sulfide volcanic deposits.
Other varieties of purple chalcedony come from the Holley, Oregon, Nevada and other locations.