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Sepiolite

Chemical Formula:? Mg4Si6O15(OH)2·6(H2O)?
Composition:? Molecular Weight = 613.82 gm?
Magnesium ?15.84 %? Mg?? 26.26 % MgO?
Silicon??? 27.45 %? Si?? 58.73 % SiO2?
Hydrogen???1.97 %? H???　17.61 % H2O?
Oxygen???? 54.74 %? O?
　　　　　______??????? ______??
　　　　　100.00 %????? 102.61 % = TOTAL OXIDE?
Empirical Formula:? Mg4Si6O15·6(H2O)?
Environment:? Secondary mineral associated with serpentine. Can precipitate from alkali saline waters in arid environments.?