Sand is a common surface block.
Sand can be mined with anything, but using a shovel will speed up the process.
When Fishing, there is a slight chance that you fish up sand, this makes it renewable.
A unique quality to sand is that is falls if there is nothing below it. This makes it a very poor building material, as you cannot use it for a ceiling. Although, you can smelt it to create glass, which is good for building with.
Sand can be smelted to create glass.
Four pieces of sand can be crafted into sandstone.