Beach picnics leave something to be desired. That gritty texture as the sand blows into the sandwiches; the added crunch in the ice-cream. Sand is comprised primarily of tough silica (silicon dioxide) crystals that resist the constant grinding of waves on a beach.
Have you ever noticed how pears in some ways resemble beach food? When you chew a pear, you can feel a rough, gritty texture. It’s very similar to sand contaminated food. In fact, the similarities do not stop at the texture. The gritty particles in pears are actually silica as well – produced in the sclereid cells of the tissue layer called the sclerenchyma.