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Large quantities of a green mineral gemstone have been found on Mars. Rocky outcrops of the mineral olivine were spotted by a space craft orbiting the planet... |
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| Gemstones found on Mars (November 2003) |
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On Earth, the mineral is known as Peridot, an inexpensive gemstone used in jewellery. Its presence gives clues to the ancient history of Mars, suggesting the planet has been cold and dry for billions of years. The exposed mineral is weathered away in warm, wet conditions. If it has been there for billions of years, as geological evidence suggests, then Mars must have been cold and dry for much of that time. Scientists now need to pin down the precise age of the mineral, found over a 30,000-square-kilometre area in a long, narrow, shallow depression known as Nili Fossae... |
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