Moonstone

Physical Properties

Hardness: 6–6.5 (Mohs scale), Color: Peach to beige-brown with adularescence, Luster: Vitreous to pearly, Crystal Structure: Monoclinic, Cleavage: Two directions at 90 degrees

Formation & Geological History

Formed in igneous and metamorphic rocks through the cooling of silica-rich magma where orthoclase and albite separate into microscopic layers. The interaction of light with these layers causes the glow.

Uses & Applications

Primarily used in jewelry for cabochons and beads, as well as a popular specimen for metaphysical and mineral collectors.

Geological Facts

The shimmering effect of moonstone is known as adularescence, caused by light scattering between alternating layers of feldspar. It was highly popular during the Art Nouveau period and is the state gem of Florida.

Field Identification & Locations

Identify by its distinctive internal blue or white sheen (adularescence) when rotated under light. Commonly found in Sri Lanka, India, Myanmar, and Madagascar.

Identified on: 4/28/2026

Mode: Standard