By glassy, the eruption cloud that coarse rock particle forms jams not only engine, still can wear away windshield, attaint plane navigation and communication system.
由玻璃质的、粗糙的岩石微粒构成的火山灰云不仅堵塞发动机，还会磨损挡风玻璃，损坏飞机导航与通讯系统。
The deformation of olivine and pyroxene in the rock is the recrystallized process from coarse to fine grain, the spinel has obvious dissolution, migration and reprecipitation.
岩石中橄榄石和辉石的变形都是由粗变细重结晶过程，尖晶石则有较明显的溶解、迁移和再沉淀作用。
A coarse-grained, plutonic or intrusive igneous rock of felsic composition having large crystals of quartz, feldspar and mica.
一种粗粒的，深成的或侵入的长英质成分的火成岩，含石英、长石和云母的粗大晶体。
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