This mineral, a hydrated aluminum phosphate, typically exhibits a distinctive green hue, ranging from a pale, yellowish-green to a deep, emerald green. Its color arises from the presence of chromium and vanadium within its crystal structure. Often found in masses or nodules with a cryptocrystalline or microcrystalline texture, it can also display a botryoidal or reniform habit. A vitreous to waxy luster characterizes polished specimens, adding to their visual appeal.
The unique attributes of this attractive material have led to its widespread use in lapidary work, particularly for cabochons, beads, and carvings. Its relative softness, typically measuring between 4.5 and 5 on the Mohs hardness scale, makes it relatively easy to work with, while its inherent beauty lends itself to various artistic applications. Historically, it has been prized for its ornamental value, with archaeological evidence suggesting its use in adornments by various cultures throughout history. Its inherent aesthetic qualities continue to be appreciated in contemporary jewelry design.
