Apophyllite is a beautiful mineral, forming in lustrous, transparent crystals that are well-formed. Its found worldwide in volcanic zeolite environments. These minerals are typically found as secondary minerals in vesicles in basalt or other volcanic rocks. Apophyllite was first discovered between the 18th and 19th century. The most sought after beauties in this group of crystals are said to be the green stones and hail from Poona in India.