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The orthostone of the alkaline massif

The orthostone of the alkaline massif

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Syenite is a kind of magmatic rock, which belongs to neutral deep intrusive rock. light gray, with grainy, porphyritic structure. The content of silica (about 60%) and the diorite is quite, but the alkali (sodium oxide, potassium oxide) is slightly higher than the diorite. It is mainly composed of feldspar, hornblende and biotite, with no or very little quartz. Alkaline feldspar (usually orthoclase, microcline, striated feldspar) accounts for more than 70% of the feldspar. It is often a small rock strain, which forms a complex with basic rocks and alkaline rocks.

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