mineral

Rhodonite, Gray Moonstone, and White Feldspar Mix

Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)

Hardness: 5.5-6.5 (Rhodonite/Feldspar). Colors: Pink with black manganese inclusions (Rhodonite), pearly translucent gray (Moonstone), chalky white (Feldspar). Luster: Vitreous to pearly. Crystal Structure: Triclinic/Monoclinic.

Hardness: 5
Luster: Vitreous to pearly

Identified March 16, 2026More mineral →

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Physical properties

Formation & geological history

Metamorphic and igneous origins. Rhodonite forms in manganese-rich metamorphic rocks and hydrothermal veins. Feldspars/Moonstones form from cooling magma or high-grade metamorphic processes throughout various geological ages.

Uses & applications

Used primarily in jewelry (cabochons and beads), decorative ornamental carvings, and as aggregate. Rhodonite is an ore of manganese, while feldspars are used in ceramics and glassmaking.

Geological facts

Rhodonite is the state gemstone of Massachusetts. Moonstone exhibits an optical phenomenon called adularescence, caused by light scattering between alternating layers of orthoclase and albite.

Field identification & locations

Identify in the field by checking the pink-black contrast for Rhodonite and the pearly 'sheen' for Moonstone. Found globally including Russia, Brazil, USA, and Sri Lanka. Collectors look for high color saturation and translucency.

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