Peach Opal
Hydrous Silicon Dioxide var. Peach Opal · Semi-Precious Gemstone
Crystal System
Amorphous (Non-crystalline)
Mineral Group
Silicates
Chemical Formula
SiO2·nH2O
Formation Process
Sedimentary or hydrothermal deposition from silica-rich groundwater in cavities of various rock types at low temperatures.
About This Crystal
An oval-shaped cabochon featuring a soft peach to pale apricot body color with intricate, web-like matrix veins in a slightly darker tone, displaying a smooth polished surface and a subtle play-of-color flash.
Physical Characteristics
Peach body color with white streak, amorphous habit, no cleavage, conchoidal fracture, specific gravity around 2.10-2.20, brittle tenacity, and occasional greenish or yellowish fluorescence under UV light.
Optical Properties
Refractive index ranges from 1.37 to 1.47, isotropic (singly refractive) due to amorphous structure, exhibiting faint opalescence and occasional play-of-color.
Hardness & Durability
Origin Region
Mexico, Australia, Madagascar, and the USA
Hardness & Durability
Mohs hardness of 5.5 to 6.5, low toughness making it sensitive to sharp impacts, highly sensitive to sudden temperature changes, acids, and dehydration.
Care & Maintenance
Clean with mild soapy water and a soft cloth; avoid ultrasonic cleaners, steam, harsh chemicals, prolonged direct sunlight, and extreme temperature fluctuations.
Rarity & Value
Uncommon to rare depending on the intensity of the peach hue and play-of-color; valued based on color saturation, pattern, and cut, generally affordable to moderate in price.
Special Characteristics
Contains internal water content (typically 3 to 21 percent), often exhibits subtle matrix patterns and localized opalescent flashes of color.
Lore & History
Associated with emotional healing, soothing anxiety, and opening the sacral chakra, though these are traditional beliefs without scientific backing.