mineral

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Hardness: 6-6.5 on Mohs scale; Color: Peach, salmon, or orange-beige; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.56-2.59. It exhibits adularescence, a soft glow seen under the surface.

Hardness: 6-6
Color: Peach, salmon, or orange-beige
Luster: Vitreous to pearly

Identified March 25, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed in igneous and metamorphic rocks through the cooling of silica-rich magma or the metamorphosis of existing feldspar. As the magma cools, two types of feldspar (orthoclase and albite) separate into alternating layers, creating the light-scattering effect.

Uses & applications

Primarily used in the jewelry industry for cabochons, beads, and carvings. It is also a popular stone for mineral collectors and practitioners of crystal healing for its aesthetic and symbolic value.

Geological facts

Moonstone is the most famous gem-quality variety of k-feldspar. The 'peach' variety specifically gets its color from trace amounts of iron or other inclusions. Historically, moonstones were believed by Romans and Greeks to be drops of solidified moonlight.

Field identification & locations

Identify in the field by its distinct waxy to pearly luster and the 'schiller' effect (metallic iridescent glow) when tilted. It is commonly found in Sri Lanka, India, Madagascar, and Myanmar. For collectors: look for even color and a strong, centered glow.