Silicon dioxide is a chemical compound that is also called silica. Silica sand is a type of sand that mainly features tiny granules of quartz. Quartz itself comes in many varieties, depending on to its color and micro-structure. Silica sand additionally consists of other fine debris of rock and mineral. Grains of silica sand range in diameter from 1/16 mm to 2 mm, which is roughly 2/1000 of an inch to 8/100 of an inch. Silica sand is a natural material mined in Florida and is the main ingredient used to replenish beach’s throughout all of Florida’s coast lines. Silica sand is a natural mined material.
References: The sand & Gravel Resources