Rarest And Most Valuable Opals In The World Opal is composed of small beads of silica â alpha-cristobalite â low temperature, but tightly closed in a waterproof casing. Between these âbeadsâ have cavities that contain a small amount of water.
Inorganic nutrients that facilitate growth and development in organisms include phosphorous, calcium, nitrogen, iron and fluorine. There are many different kinds of inorganic nutrients, and they are all characterized by their lack of carbon-to-carbon bonds.
Each is equally important to the plant, yet each is required in vastly different amounts. These differences have led to the grouping of these essential elements into three categories; primary (macro) nutrients, secondary nutrients, and micronutrients. PRIMARY (MACRO) NUTRIENTS.