Lake Ellen Kimberlite, Volcanic formation in Crystal Falls region, Michigan, United States
The Lake Ellen Kimberlite spans 200 meters in diameter, featuring a smaller adjacent body measuring 25 by 90 meters in northern Michigan's Upper Peninsula.
The geological formation was discovered in 1971 during logging road construction, leading to its first scientific documentation published in 1981.
The formation draws mineral collectors searching for distinctive stones like pyrope, magnesian ilmenite, and chrome diopside within the weathered fragments.
The site intersects with Proterozoic volcanic rocks and contains fragments of crustal schist, granulite, and rare xenoliths from the upper mantle.
The kimberlite pipe formed approximately 180 million years ago at depths between 105 and 140 kilometers beneath the Earth's surface.
Location: Michigan
GPS coordinates: 46.17470,-88.17670
Latest update: April 2, 2025 06:52
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