Petroleum Quartz, also known as Liquid Quartz or Oil Quartz, is a unique and visually striking variety of quartz characterized by its unusual appearance. The stone contains fluid-like inclusions, often resembling swirling, oil-like patterns or bubbles within the crystal. These inclusions are typically pockets of liquid or gas trapped inside the quartz as it formed, giving the stone a dynamic, fluid-like effect.

The quartz itself is usually clear or translucent, though the inclusions can add a golden, brown, or even greenish tint, depending on the minerals involved. Petroleum Quartz is often used in jewelry and decorative items, prized for its intriguing visual qualities and the contrast between the solid crystalline structure and the flowing, liquid-like inclusions within.

Metaphysically, some believe that Petroleum Quartz has grounding and healing properties, helping to bring balance and stabilize energy. However, it's primarily sought after for its beauty and unique formation.