is silica sand made out of basalt
The density of basalt is quite high, which can be seen through the combination of the rocks porosity: 1%, and its bulk density: 3 Mg (megagram) per m 3, This is because, around 50 percent of basalt is made of silica. Uses of Basalt Rock. What is sand made of Sandatlas. First, quartz is very important rockforming mineral.

 
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