Granite花岗岩
Granite is an igneous rock in the class designated as "felsic" rock. This class of rock crystallizes from silicate minerals at relatively low temperatures and with relatively a high percentage of silica . It is at the low temperature extreme of the Bowen reaction series. 花岗岩是一种被归类为“长石质”类的岩浆岩。这类岩石是在相对较低的温度下，由硅酸盐矿物结晶而成，且含有相对较高的二氧化硅含量。它处于 Bowen 反应系列的低温端。
Granite is probably the best known of all igneous rocks. It is abundant and it is widely used in both construction and decoration. Many types of granite have great beauty when polished. In texture it is classified as phaneritic. Granite has 25 to 35% quartz in roughly spherical crystals. They may be clear to light gray. It has over 50% potassium feldspar and sodium-rich plagioclase. The feldspar crystals are more rectangular in shape and are usually white to gray or salmon-pink in color. 花岗岩可能是所有火成岩中最为人所知的。它很丰富，并且广泛用于建筑和装饰。许多种类的花岗岩在抛光后具有极高的美观性。在结构上，它被归类为phaneritic。花岗岩中含有25到35%的石英，这些石英以近球形晶体形式存在。它们可能是透明的或浅灰色的。它含有超过50%的钾长石和钠质斜长石。长石晶体形状更接近矩形，通常呈白色、灰色或 salmon-pink 色。
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Index Igneous rock concepts Reference Lutgens & Tarbuck Ch 3 索引 火成岩概念 参考 Lutgens & Tarbuck 第3章 | ||
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