The feldspar group contains tectosilicate minerals with similar properties, including orthoclase, albite and labradorite. Feldspars make up more than 60% of the upper crust of the earth.
长石系列
含网状矽酸盐的

且有
似的
,
括正长石,钠长石以及拉长石.长石构成了60%的上层地壳.
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境 The butler whose first person narration provided between the lines portrait of morality among the English upper crust in the into war years As a rebuke to the hyper engineered society that created her Clara's paradoxically humane conduct lends.
管家以第一人称叙述,在字里行间勾勒出一战期间英国
流社会的
德画像。作为对高度工程化社会的一种讽刺,克拉拉那看似矛盾的人性化行为却显得尤为突出。