Then plant it in pure quartz sand, never anything else.

The principal thing is to get the pure quartz.

It may be pure quartz; but oftener it is mixed with silicates from the rock containing the mineral.

There is also added some more fusible substance, such as feldspar, gypsum, or lime, together with some pure quartz.

The best soil for it appears to be a pure quartz sand, which in some places rests on black moss or mould.

To simulate sand transport on Mars, the scientists tumbled pure quartz in a hermetically sealed flask for seven months, flipping each flask 10 million times.

Pure quartz weighs 165 lbs., per cu.