Elbaite with a very interesting pink cap

Tourmalines are a group of minerals belonging to the silicate class, in the cyclosilicate order. The name derives from the Sinhalese word turmali, which literally means 'mixed package' or 'stone of various colors', and in the past it referred to the crystals carried to Europe from Ceylon. The crystal belongs to the trigonal system, is prism-like, highly elongated, vertically striated, and sometimes with unequal development at the two ends of the vertical axis. Its color depends on its chemical composition and may not be uniform within the crystal.

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