Quartz table is marked with a lot of lines, you can drop one or two drops of water on the table, and then squeeze a little toothpaste rub, you can remove the lines and make the table a new.
石英表蒙被划出很多道纹以后，可以在表蒙上先滴一二滴清水，再挤一点牙膏擦涂，就可以把划纹去掉而使表蒙如新了。
Any of various dark, granite - textured, crystalline rocks rich in plagioclase and having little quartz.
闪长岩一种黑色花岗岩的纹理的结晶质火岩石，富有斜长石，含有少量石英。
The main metal mineral in a cyanide tailing is pyrite and a little sphalerite, galena and chalcopyrite, gangue mineral is quartz.
某氰化尾渣金属矿物以黄铁矿为主，有极少量闪锌矿、方铅矿和黄铜矿，脉石矿物以石英为主。
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