text: Type I diamonds contain impurities of this element, which forms a network solid with a cubic gauche structure at high pressure and temperature.
full_question: Type I diamonds contain impurities of this element, which forms a network solid with a cubic gauche structure at high pressure and temperature. This element is found in chitin but not cellulose. Phosphate groups, sugars, and compounds named for this element combine to form nucleotides. Hexazine is a hypothetical allotrope containing six atoms of this element, whose main allotrope contains a triple bond. For 10 points, name the element that is transferred between organisms and the atmosphere in its namesake cycle.
first_sentence: Type I diamonds contain impurities of this element, which forms a network solid with a cubic gauche structure at high pressure and temperature.