PP-AVE-02 Dimensions: Approximately 44mm x 42mm Weight: Approximately 20g Heart-shaped green aventurine thumb stone measuring 44mm x 42mm. Thumb stones can be used as massage stones or as stress relievers. Due to its particular shape, the aventurine heart fits well in the palm of the hand, with the thumb resting in the stone's indentation. As with classic thumb stones, the movement of the thumb gently stimulates local reflex zones. Aventurine belongs to the quartz family. It has different colors due to the presence of mineral or metallic inclusions. Green aventurine has this beautiful color due to the presence of fuchsite, a mica rich in chromium.