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Why are walnut and hickory woods valued for their grain patterns and luster?

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The woods of the Juglandaceae family, which includes both walnut and hickory, are highly valued for their aesthetic qualities.

Their distinct grain patterns and characteristic luster are primarily attributed to local bands of cells known as wood rays. These rays radiate toward the perimeter of the tree trunk, creating the visual depth and sheen for which these timbers are prized.1