Syenite in alkaline rock mass
Geography
rock
Rock 3D model
stone
Mineralogy Science Popularization
Syenite
Alkaline rock mass
Alkaline rock body syenite
Neutral plutonic intrusive rock
Magmatic rock
3
Coin
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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.
