tourmalines in English
noun
1
a typically black or blackish mineral that occurs as prismatic crystals in granitic and other rocks. It consists of a boron aluminosilicate and has pyroelectric and piezoelectric properties.
In the line rock, this black tourmaline occurs as tiny prismatic crystals.
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1. 5 Apatite, commonly seen as a blue or green transparent gem, is heated to produce electric blue colors like those found in Paraiba tourmalines.