Биотит [Nature Category:
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The most important words from all discussions“Биотитът е широко разпространена магнезиево-желязна слюда от клас силикати. Получава името се през 1847 година в чест на френския физик, астроном и математик от 19 век Жан-Батист Био, изучавал оптичните свойства на слюдите. По състав е междинен минерал между чисто магнезиевите и чисто железните слюди. Химичната формула на биотита и някои негови разновидности е K(Mg,Fe)3[AlSi3O10](OH,F)2. …” (Wikipedia) (Wikipedia translated)
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