Greenstone refers to a type of smooth and durable stone that is usually green in color. It is often used to make jewelry or carve sculptures. Full definition
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Between the two projects, Great Bear now has agreement in place to control 9,831 hectares of prospective greenstone belts. (greatbearresources.ca)
After Haast the route turns inland to Pleasant Flat and the northern margins of Mt Aspiring National Park to the Gates of Haast, the most recent pass across the Alps The route you follow is that of the ancient Maori greenstone trail, which climbs steeply through rocky terrain, with breathtaking views of Mt Brewster and the many rivers and waterfalls that cross this area. (acrossnz.com)
Now it ferries physicists and other visitors to a $ 16 million apparatus [pdf] they've built in a cavern blasted out of greenstone nearly a half mile beneath the hardscrabble town of Soudan, in northern Minnesota. (discovermagazine.com)