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Migmatites often appear as tightly, incoherently folded veins (ptygmatic folds). [3] These form segregations of leucosome, light-colored granitic components exsolved within melanosome, a dark colored amphibole- and biotite-rich setting. If present, a mesosome, intermediate in color between a leucosome and melanosome, forms a more or less ...
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It is about 250 km long and 30–50 km wide, running northwest to southeast from Alcácer do Sal (Portugal) to Sevilla (Spain). [1] The mining activity in this region goes back thousands of years. The Iberian Pyrite Belt has had more than 2000 million tons of ore removed, and still has more than 400 million left to exploit.
(Note though that the iron atoms in the faces are not equivalent by translation alone to the iron atoms at the corners.) The pyrite structure is also seen in other MX 2 compounds of transition metals M and chalcogens X = O, S, Se and Te. Certain dipnictides with X standing for P, As and Sb etc. are also known to adopt the pyrite structure. [37]
Nutmeg contains a substance called myristicin, which can cause some serious problems. The most serious of those are hallucinations but also include vomiting, disorientation, and even seizures.
Originally calcitic crinoid stem (in cross-section) diagenetically replaced by marcasite in a siderite concretion; Lower Carboniferous.. The term diagenesis, literally meaning "across generation", [3] is extensively used in geology.
Multiple women's golfers have spoken out in support of the LGPA's new rule that bars post-pubescent males from competing against female golfers.
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