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Chlorastrolite occurs as amygdaloid structures and fracture fillings in basalt, and when the water and wave action has worn away the basalt, they are found as beach pebbles and granules in loose sediments. It is found in the Keweenaw Peninsula of the Upper Peninsula of Michigan and Isle Royale in Lake Superior. Isle Royale is a National Park ...
Amazonite, also known as amazonstone, [4] is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. [4] [5] [6] Its chemical formula is KAlSi 3 O 8, [1] [7] which is polymorphic to orthoclase.
El Señor de las Limas, the largest known greenstone sculpture, Xalapa Museum Greenstone staff, 1550 - 1600 AD, from the Tairona culture of present-day Colombia.. Greenstone is a common generic term for valuable, green-hued minerals and metamorphosed igneous rocks and stones which early cultures used in the fashioning of hardstone carvings such as jewelry, statuettes, ritual tools, and various ...
The police investigation unfolded all across the nation, from the Southwest, where the bones were found, to a DNA lab in Texas, and finally to Trout Creek, Michigan, in the western Upper Peninsula ...
The trail extends from Windigo Harbor and the Windigo Ranger Station on the island's western end, east across Isle Royale, to Rock Harbor and the Rock Harbor Lodge. [1]The Greenstone Ridge Trail generally follows the top of Greenstone Ridge, a low ridge that forms the east/west spine of the island and surmounts Mount Desor, the highest point of Isle Royale. [1]
A survey of Lake Michigan located at least 40 large craters on the lakebed. Initial studies highlighted the spots as unknown shapes, but additional research revealed the craters are filled with ...
Human remains have been found on the property of the husband of Dee Ann Warner, a Michigan woman who has been missing since 2021, ... a Michigan woman who has been missing since 2021, police said ...
Metamorphosed pillow lava from the Ishpeming Greenstone Belt in Michigan. Greenstone belts have been interpreted as having formed at ancient oceanic spreading centers and island arc terranes. Greenstone belts are primarily formed of volcanic rocks, dominated by basalt, with minor sedimentary rocks inter-leaving the volcanic formations.