Pink Opal / Peruvian Opal

Hardness: 5.5-6.5 on Mohs scale; Color: Ranges from soft pastel pink to lavender-pink, often with white, cream, or beige inclusions; Luster: Vitreous to waxy; Crystal Structure: Amorphous (lacks a defined crystal structure); Specific Gravity: 1.9-2.3; Fracture: Conchoidal; Noteworthy for its lack of play-of-color, distinguishing it from precious opal, but sometimes exhibits a soft glow (opalescence).

Pink Opal is a common opal variety. It forms from the precipitation of silica-rich waters at low temperatures, often filling fissures and cavities in igneous or sedimentary rocks. The pink color is attributed to trace amounts of quinones or other organic compounds, or sometimes to small inclusions of palygorskite. Most significant deposits are Cenozoic in age.

Primarily used in jewelry for its attractive pastel pink color, often cut into cabochons, beads (as seen in the image), and carvings. It is popular in metaphysical practices, believed to promote emotional healing and tranquility. It is not typically used in industry or construction due to its relative softness and amorphous nature.

Pink Opal is often referred to as 'Andean Opal' or 'Peruvian Opal' because the most prominent and high-quality sources are found in the Andes Mountains of Peru. Unlike precious opal, common opal like pink opal does not exhibit the iridescent 'play-of-color' phenomenon caused by the diffraction of light within its internal structure of silica spheres. It is sometimes dyed to enhance its color, so care should be taken when purchasing. Its gentle color makes it a favorite for feminine and calming jewelry designs.

In the field, Pink Opal can be identified by its distinctive pink to peach color, often with white or cream streaks and inclusions. Its waxy to vitreous luster and amorphous texture (no obvious crystal faces) are key indicators. It will feel relatively light due to its low specific gravity. It is predominantly found in Peru, particularly in the Andes, but also in some parts of the USA, Mexico, and Australia. Collectors value specimens with vibrant, uniform color and interesting patterns. When found in situ, it often occurs as veins or nodules in volcanic rocks. In jewelry, it's recognized by its soft, non-iridescent pink hue.