Super Skeletal FENSTER Golden Enhydros With Oil Diamond Grade Super Skeletal Fenster Golden Enhydros are rare, high-vibration quartz crystals (often from Pakistan/Himalayas) containing trapped, ancient petroleum oil, visible as liquid inclusions. These skeletal "Fenster" (window) crystals are characterized by complex, layered, and hollowed formations, with the entrapped oil often fluorescing neon green or yellow under UV light. Petroleum Oil Inclusions: Small amounts of liquid, golden petroleum are trapped inside the crystal, sometimes with gas bubbles (enhydros) as seen in the photos.