What is the chemical composition of emerald and how hard is it?

Emerald is a silicate containing beryllium and aluminum, and its molecular formula is Be3Al2[Si6O 18].

Emerald belongs to beryl family and belongs to hexagonal system. Crystals are usually hexagonal columns with few vertebral surfaces. There are pits on the cylindrical surface and the bottom axial surface. The hardness is 7.5-8.

Beryllite, also known as "emerald", is a beryllium aluminosilicate mineral. Beryl is mainly produced in granite pegmatite, but it is also found in sandstone and mica schist, and often coexists with tin and tungsten.

Pure beryl is colorless and even transparent. But most of them are green, but also light blue, yellow, white, rose, with glass luster.

Emerald green and blue are the most common, yellow green, yellow and pink are also common, and there are other special varieties such as brown, white, gray and black. Some beryls may have ribbons, transparent to translucent, and glassy luster.

Application:

As a mineral, beryl is mainly used to extract beryllium. In ancient Europe, beryl was made into a transparent ball for divination, and later it was changed into a ball made of crystal. Beryl with beautiful appearance is a precious gem, which is used as an ornament.