The basic ingredients in glass, including silicasand and soda ash, are found almost everywhere.
玻璃的基本原料，包括硅砂和纯碱，几乎可以在任何地方找到。
2
Medium hard formation with high compressive strength. Such as limestone, taconite, blaize, quartzite, silicasand, basalt, granite ect.
高抗压强度的硬地层，如硬石灰岩。燧岩。硬砂岩。石英岩。石英砂。玄武岩。花岗岩等极硬岩层。
3
The thermal expansion values of the precoated non silica and have been measured and contrasted with them of the precoated silicasand on the same conditions.