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Backlight this hand carved Orange Onyx Bowl from Mexico to reveal the natural banding in the stone.
When water, rich in the minerals calcite and iron oxide, emerges from a spring, the minerals precipitate out of the water to form calcite crystals. Calcite is usually clear or white, but iron oxide gives the calcite a warm, honey/orange color. The banding in this bowl shows the waxing and waning abundance of iron oxide in the water.
The bowl is 36x28x11cm and weighs 4.6kg.