The Payzac Quartzite has crossed the staurolite isograd, the Upper Gneiss Unit belongs mainly to the staurolite zone and parts of the Lower Gneiss Unit even have reached the kyanite isograd ( near the village center and in the north ).
32.
Some scientists say the number of riddles and assumptions is too great to offer strong support of the idea that the discovered staurolite cycled from the surface to the mantle and back up again, and that some other mechanism must account for its mysterious existence.
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Another mystery is that the carbon of the diamond surrounding the staurolite has isotope ratios heavy in carbon-13, suggesting that its origins lie in the mantle, rather than in organic materials of the surface regions with their characteristic lack of carbon-13.
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"' Fairy Stone State Park "', located in Patrick County, Virginia, is the largest of the original six state parks that opened on June 15, 1936, and is home to the mysterious " fairy stones ", or staurolite.
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This approach was used in 1990 to reconstruct the 3D structure of the mineral staurolite HFe 2 Al 9 Si 4 O 4 and more recently to determine the structures of the huge quasicrystal approximant phase ?-AlCrFe and the structures of the complex zeolites TNU-9 and IM-5.
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A scientific team from the University of Cape Town in South Africa and the University of Edinburgh in Scotland describe in the current issue of the journal Nature how they found a speck of staurolite encased inside a diamond, suggesting that at least part of the earth's crust made the round trip to geophysical hell and back.
