Tourmaline indigolite is a mineral of the tourmaline family distinguished by its color.
The name ingolite comes from the Latin "indicum" meaning "from India", indigo is mainly the name of the color derived from the dye of indigo of a very pronounced dark blue.
The main deposits of ingolite tourmalines are the same as those of paraiba tourmalines. The blue-colored tourmalines are very rare, the main deposits are in Brazil, Nigeria and Mozambique, but also in Afghanistan.
As its name suggests, indogolite tourmaline is a dark violet, blue or duck blue tourmaline.
Blue tourmaline is a complex borosilicate of aluminum, magnesium and iron, with other elements giving it its unique color.
The Mohs scale, which ranks stones according to their hardness on a scale of 10, rates tourmaline 7.5, the same as beryls (emerald family, aquamarine and morganite) and garnets.
Blue tourmalines are often heat treated to give them their beautiful blue.
Tourmaline is the stone associated with the month of October, and indigolite tourmaline can be especially gifted on the occasion of the 16th wedding anniversary.
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