10/16/2026
Nephrite jade colors are primarily caused by variations in iron content and trace mineral impurities within its fibrous tremolite-actinolite mineral structure.
Iron is the main coloring agent in nephrite. Higher amounts of iron produce deeper green to dark-green shades. These warm or rusty colors typically develop from iron oxidation, weathering, or surface staining over long periods in alluvial or terrestrial deposits.
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