As the name implies, brick sand is the preferred sand of bricklayers. It can also be known as fatty sand or brickie's sand, and has a clay component that makes it sticky.
When blended with cement and lime to make mortar, the resulting mix is termed ‘fatty’, which means it is easy to work with when laying bricks, as it is compressible and oozes out of the joints. It is a major component of brick and block laying mortar and bagging for walls. The clay content can leave colour on hands or clothing.
It’s available in yellow and white to allow for different mortar colours.