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Water Casting - when melted metal is poured into water to achieve irregular forms.
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Wax Agate - a yellow to yellowish-red variety of agate with a waxy luster.
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Wax Opal - a yellowish-brown common opal with a waxy luster.
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Waxed Turquoise - a turquoise whose color has been deepened by soaking it in paraffin wax.
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Wet Diggings - diamond mining associated with alluvial rather than pipe deposits.