反映土壤理化性质并影响土壤利用管理的颗粒大小级别、矿物学类型和土壤温度级别是理想的土族分类标准；
Three soil characteristics are selected as family classification criteria. They are particle-size class, soil mineralogical type and soil temperature regime.
通过煤质特征、 矿物学和元素的组相关性分析，概括了引起这两种类型煤常量和微量元素之间差弄的地质原因。
Through analyses of relativity on coal quality and mineralogy and elements, summarized geological reasons caused differences between norm al and trace elements in the two types of coal.
弄清楚行星演变的不同阶段产生的具体矿物类型，以及哪些矿物是由后来出现的生物体产生的，这对于了解其它行星和月球的矿物学是至关重要的。
Knowing which minerals form at different stages of a planet's evolution, and which depend upon life to be present, are crucial to understanding the mineralogy of other planets and moons.
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