Blue and purple sand color close, while for the blue, sand part blue sandstone said.

蓝砂石颜色接近紫色，里边的砂部门为蓝色，故称蓝砂石。

youdao

And it well accustomed to building sand and road sandstone.

对建筑用沙，筑路用沙石优为适宜。

youdao

And it well accustomed to building sand and road sandstone.

对建筑用沙，筑路用沙石优为适宜。

youdao