Petroleum quartz, also known as golden enhydro, is a unique and relatively rare variety of quartz crystal. It's known for containing trapped pockets of fluid, often identified as ancient petroleum, within its crystal structure. These inclusions can be millions of years old and sometimes fluoresce under ultraviolet light. Petroleum quartz typically has a transparent or translucent body with a golden or yellow hue. The most distinctive feature of Petroleum Quartz is the presence of tiny moving bubbles of petroleum oil trapped within the crystal. These inclusions can range in size from microscopic to barely visible to the naked eye. They can sometimes be mobile and move around freely when the stone is tilted, adding a dynamic element to the crystal's appearance. Is Petroleum Quartz rare? Yes, Petroleum Quartz is a relatively rare variety of quartz due to the specific geological conditions required for its formation.. The size is 1.9 x 1.4 x 1.2 CM