Mineral 1.0Test your knowledge of specific minerals

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  SilicateTourmaline
Na(Mg,Fe,Li,Mn,Al)3Al6(BO3)3Si6O18(OH,F)4

Most distinguishing features:
Columnar crystals and vertical striations are characteristic, also has poor cleavage.

Industrial/economical uses:
Gemstone. Due to piezoelectric properties, it is also used in the manufacture of pressure gauges and other electronic components.