Beryl

Unknown Owner

An attractive loose cluster of lustrous translucent green barrel crystals, this is the variety known as emerald. In very good condition. Neat locality for this variety of the species.Emerald is the green variety of the mineral beryl, and its color is caused by trace amounts of chromium and sometimes vanadium within the crystal structure. These elements substitute for aluminum in the beryl lattice and absorb certain wavelengths of light, producing the characteristic green color. The intensity and tone of the green can vary depending on the concentration of these trace elements and the conditions under which the emerald formed.