A hard, dark green metamorphic rock often containing hornblende or chlorite minerals, commonly used for building and tools.
English compound from 'green' (referring to the color) plus 'stone,' used since at least the 16th century in geology; the color comes from mineral composition rather than weathering.
Greenstone has been treasured for over 2,000 years—ancient New Zealanders called it 'pounamu' and made intricate jade-like carvings from it because it's incredibly durable!
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