Ovulatory dysfunction is the most common cause of AUB in adolescents. As noted (see Pathophysiology), cycles are not consistently ovulatory for the first few years after menarche, especially if menarche occurs at a later age.
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The crystal structure of zircon is tetragonal crystal system. The natural color of zircon varies between colorless, yellow-golden, red, brown, blue, and green. Colorless specimens that show gem quality are a popular substitute for diamond and are also known as Matura diamond.ts chemical name is zirconium silicate and its corresponding chemical formula is Zr SiO4. A common empirical formula showing some of the range of substitution in zircon is (Zr 1ây, REE y)(SiO 4) 1âx (OH) 4xây. Zircon forms in silicate melts with large proportions of high field strength incompatible elements.