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：2025/11/27
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(mineralogy) An earthy black oxide of copper, arising from the decomposition of other ores.
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melaconite
The miners were excited to find melaconite in the old vein, knowing it formed from the decomposition of other copper ores.
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The miners were excited to find melaconite in the old vein, knowing it formed from the decomposition of other copper ores.
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