dgadee
Well-Known Member
There is a worldwide shortage of sand.
Worth bearing in mind that "sand" comes in many types! Mostly it's sand made of quartz grains, which might be rounded or angular - that matters, I understand, when it comes to its use in concrete. But sand is a grain size definition, not a composition. The sand in the Cornish waste tips, for example, will have a high quantity of feldspar as well as quartz, and that would render it unsuitable for building use (Feldspars break down slowly into clay minerals in the presence of water; hence the China Clay deposits in Cornwall!). And some sand is made up of other minerals - black sand results from the breakdown of some volcanic rocks; there's even radioactive sand containing thorium in some places! Many other minerals can occur in sands, but as far as I'm aware, only fairly pure quartz sand is suitable for building.There is a worldwide shortage of sand.
only fairly pure quartz sand is suitable for building.