Rough Dark Green Aventurine Quantity: 1 kilogram Size: 1-2 inches Aventurine is formed through the inclusion of sparkling minerals like mica or hematite during the crystallization of quartz in metamorphic rocks, creating its distinctive shimmering effect and vibrant colors through geological processes that involve heat and pressure. Uniqueness Guaranteed: Every gemstone piece is one-of-a-kind so they can vary in size, shape, and color. While we select them at random, they'll be as beautiful as those in the photos. Custom Requests: Have specific preferences? Leave a message with your order, and we'll do our best to accommodate your requests if possible.