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Garnierite is one of the most soothing and visually lush green stones available to lapidaries, prized for its soft, mottled palette of mint, sage, seafoam, and deeper forest green that shifts and blends across the surface of each cabochon in a way that feels almost painterly. I source this material for the quiet elegance of its coloration and the way it polishes to a smooth, waxy luster that gives finished pieces a gentle, organic warmth that pairs beautifully with both silver and copper metalwork.
Garnierite is not a single mineral but rather a trade name for a group of nickel-bearing phyllosilicate minerals, primarily a mixture of serpentine and talc, that form in the weathered zones of nickel-rich ultramafic rock deposits. The most significant sources are found in New Caledonia, Madagascar, and the Philippines, where the characteristic green coloration develops from the presence of nickel ions within the mineral structure. Its softness relative to quartz-based stones makes it a pleasure to cut and shape, and it takes a beautiful polish that highlights the subtle variation in its banding and color.