Danburite "eyes-chain" from Mexico.

The mineral Danburite is a boron-containing calcium silicate having the chemical formula CaB2Si2O8. The mineral belongs to the sorosilicaten. The transparent to translucent white, gray or yellowish Danburite a glass to oily shine, a white stripe color and cleavage is poor according to the crystal surface [001]. Danburite has an average density of 2.99, and the hardness is 7. The crystal system is orthorhombic and the mineral is not radioactive. Danburite was in 1839 to Danbury (Connecticut) was discovered in the United States. Danburite occurs mainly in pegmatites and contactmetamorfe rocks. Danburite occurs in nature for many, however, rarely in gem quality. Honey Yellow crystals occur in Baja California, Mexico, to bright pink color up to 20 cm large stones in Charcas, Mexico. Danburite is also found in Bolivia, Myanmar (large white and yellow crystals) and in Russia. Madagascar come great tan crystals.