A period is a bleed from the womb (uterus) that is released through the vagina. It happens approximately every 28 days, although anywhere between 24 and 35 days is common. Periods can begin when girls are between 8 and 16 years old, but usually start around the age of 12.
Emerald is a gemstone and a variety of the mineral beryl (Be3Al2(SiO3)6) colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7.5â8 on the Mohs scale. Most emeralds are highly included, so their toughness (resistance to breakage) is classified as generally poor.
Emerald Composition Emerald gemstone (also known as panna) is made up of silicate class of minerals, known as âBerylâ. Beryl comprise the largest class of minerals, where as Emerald are only a small fraction of this class. Emerald stone can be found anywhere on the planet. Good quality Emerald gems are found in Muzi, Chivor and Cosquez.