mineral

Peach Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Hardness: 6.0–6.5 (Mohs scale), Color: Peach, salmon, or tan. Luster: Vitreous to pearly. Crystal structure: Monoclinic. Cleavage: Two directions at 90 degrees. Specific gravity: 2.56–2.59.

Hardness: 6
Color: Peach, salmon, or tan
Luster: Vitreous to pearly

Identified April 23, 2026More mineral →

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Physical properties

Hardness: 6.0–6.5 (Mohs scale), Color: Peach, salmon, or tan. Luster: Vitreous to pearly. Crystal structure: Monoclinic. Cleavage: Two directions at 90 degrees. Specific gravity: 2.56–2.59.

Formation & geological history

Formed through the slow cooling of magma within the Earth's crust (plutonic). The characteristic sheen (adularescence) is caused by the intergrowth of two types of feldspar that exsolve as the mineral cools.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a collector's specimen. It is also significant in metaphysical and spiritual practices.

Geological facts

Moonstone is the birthstone for June and is characterized by a visual effect called adularescence, which appears as a light moving across the stone like moonlight on water. Peach varieties get their color from iron inclusions.

Field identification & locations

Identify in the field by its distinct pearly luster and peach hue. It often shows a shimmering 'schiller' effect when rotated under light. Commonly found in Sri Lanka, India, and parts of Madagascar.

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mineral