mineral
Sunstone with Moonstone (Peach Moonstone)
Orthoclase Feldspar (KAlSi3O8)
Hardness: 6-6.5 on Mohs scale; Color: Peach, salmon-pink, or flesh tones; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Two directions at 90 degrees; Specific Gravity: 2.56-2.59. It often displays adularescence (a glow) and 'schiller' or aventurescence from tiny inclusions.
- Hardness
- 6-6
- Color
- Peach, salmon-pink, or flesh tones
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Peach, salmon-pink, or flesh tones; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Two directions at 90 degrees; Specific Gravity: 2.56-2.59. It often displays adularescence (a glow) and 'schiller' or aventurescence from tiny inclusions.
Formation & geological history
Formed in plutonic and metamorphic rocks through high-temperature crystallization. Most quality specimens come from pegmatites. The peach color and flash are due to exsolution lamellae of different feldspar layers during cooling.
Uses & applications
Primarily used as a gemstone for jewelry, ornamental carvings, crystal healing, and as collector specimens in various polished forms like towers or spheres.
Geological facts
Peach Moonstone is technically a variety of Orthoclase feldspar. While standard Moonstone is known for a blue glow, Peach Moonstone is loved for its warm color and more subtle, silvery sheen. It is often found in Madagascar alongside other feldspar varieties.
Field identification & locations
Identify in the field by its distinct 90-degree cleavage planes and pearly sheen on surfaces. Common locations include Madagascar, India, Tanzania, and Sri Lanka. For collectors, look for the 'flash' or internal light when tilting the stone.
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