mineral

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Hardness: 3.5-4.5 (lower than feldspar moonstone); Color: Pale mint green to bright apple green with white veining; Luster: Pearly to dull; Crystal structure: Monoclinic; Cleavage: Often micaceous; Specific gravity: 2.2-2.8

Hardness: 3
Color: Pale mint green to bright apple green with white veining
Luster: Pearly to dull

Identified March 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed as a secondary mineral through the intensive weathering of ultramafic rocks (lateritic weathering). It is found in serpentine-rich deposits and is associated with nickel-rich clay minerals.

Uses & applications

Primarily used as an ore of nickel in industrial contexts, and as a decorative stone/crystal for carving (spheres, palm stones) and metaphysical jewelry collecting.

Geological facts

While commonly called 'Green Moonstone' in the gemstone trade, it is actually a nickel-rich ore called Garnierite. The name comes from Jules Garnier, who discovered the New Caledonian nickel deposits in 1864.

Field identification & locations

Identify by its distinctive pale 'seafoam' green color and characteristic chatoyancy or internal fractures. It is commonly found in Madagascar and New Caledonia. In the field, look for bright green staining on weathered serpentine rock.

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