weathered mica 指经长期风化作用后，物理性能发生变化，失去弹性和挠曲性能的云母。 它不能作为工业原料云母使用，所以在有效面积内不允许有风化云母存在，是鉴定工业原料云母外观质量的一个重要标准。
另外，遭受风化后的角闪石常具绿色色调，而黑云母风化后常具褐色色调。
In addition, amphibole weathering after often with green shades, and biotite weathering often with brown color.
风化度较高的赤红壤、红壤、黄红壤和黄壤等土类的粘粒云母含量一般较低。
The content of clay micas in the soils with higher weathering degree, such as lateritic red soil, red soil, yellowish red soil and yellow soil, was generally low.
所测锆石样品新鲜、未风化，岩性为粗粒黑云母二长花岗岩。
The zircon samples were fresh and unweathered. The rock is coarse-grained biotite monzogranite.
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