Silica is the name given to a group of minerals composed of silicon and oxygen, the two most abundant elements in the earth's crust. Silica is found commonly in the crystalline state and rarely in an amorphous state. Sand consists of small grains or particles of mineral and rock fragments.
Q: About sand. Sands (foreground) Pinguicula corsica A: Sand is an important component of many carnivorous plant mixes. For example, adding sand to pure peat moss provides valuable aeration. There are different kinds of sand. The most useful are ones derived from quartz. Silica sand is a nice example. It is a finegrained sand used by sandblasters.