A handy guide on Tourmaline: World’s Most Colourful Gemstone

Tourmaline & the complicated chemical compositions (Ca,K,Na, ▢)(Al,Fe,Li,Mg,Mn)3 (Al,Cr, Fe,V)6 (BO3)3 (Si,Al,B)6O18(OH,F)4 The tourmaline chemical formula is one of the most complicated, with …

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