Rubellite terminated on orthoclase

Tourmalines are a group of minerals belonging to the silicate class, order of cyclosilicates. The name derives from the Sinhalese turmali, which literally means mixed package, i.e., stone of various colors, historically indicating the name of crystals brought to Europe from Ceylon. The crystal belongs to the trigonal system, is prismatic, highly elongated, vertically striped and sometimes with uneven 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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