Bumblebee jasper from Indonesia. "This material is harvested near the steaming calderas of Mount Papandayan, an active volcano, where . native sulfur" helps produce "the vivid yellow colors." Caption from link
The range of colours shown by fluorite is equaled by few other gemstones. It may occur in beautiful cubic crystals or as a massive crystalline variety displaying banded or radiating patterns. Although the stone is somewhat soft for use as a normal.