提出了一个计算主裂片厚度的近似公式，对实验中出现的多层的呈云母状结构的次裂片现象也作出了较满意的解释。

An approximate formula for the thickness of the major spall is presented and the "mica-splitting" phenomenon about the minor spalls observed in the experiments is satisfactorily explained.

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不锈钢云母加热器有圈型和板状，异型等规格。

Stainless steel mica heater with ring type and plate shape, irregular shape and so on.

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而由云母片岩蚀变而来的绿泥石矿石呈块状或片理状、颜色为灰绿色和深灰色。

Massive pyrite-clear quartz ores and network polymetallic sulfide minerals-grey colour quartz ores formed.

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