Frequently Asked Questions . ... is found in two forms -- crystalline or noncrystalline (also referred to as amorphous). Sand and quartz are common examples of crystalline silica. ... In other cases, additional training may be needed. For example, a competent person might only need Silica sand: Silica sand consists of small, angular sand granules made of silica, which is a derivative of quartz that has been worn by the elements. It is typically inexpensive and works well in low-traffic areas. Silica Sand Need ,May 20, 2020· Pool filters also utilize sand silica to remove impurities from the water in fish ponds and swimming pools. A water feature with a sand silica filter. Landscaping has many applications for silica sand products. Golf courses, synthetic sports fields, playgrounds, and beaches all have a need for sand.