0 . 9 1 % ▁Al 2 O 3 , ▁ 2 5 . 3 3 % ▁Sn O 2 , ▁ 1 1 . 9 0 % ▁Fe 2 O 3 , ▁ 4 . 5 1 % ▁Z n O , ▁ 2 . 6 5 % ▁Fe O , ▁ 1 . 5 7 % ▁H 2 O , ▁ 1 . 2 8 % ▁M g O , ▁and ▁less ▁than ▁ 1 % ▁of ▁P b O , ▁Si O 2 , ▁Ti O 2 ▁and ▁M n O . ▁Due ▁to ▁its ▁chemical ▁composition , ▁it ▁is ▁not ▁sus cept ible ▁to ▁decomposition ▁or ▁sol ub ility ▁in ▁ac ids . ▁ ▁Fer ron iger ite - 2 N 1 S ▁has ▁also ▁been ▁found ▁in ▁some ▁cases ▁to ▁have ▁a ▁l ith ium ▁substitution ▁for ▁tin ▁and ▁tit an ium ; ▁this ▁a ids ▁in ▁charge ▁bal ancing . ▁ ▁Properties ▁ ▁Fer ron iger ite - 2 N 1 S ▁poss esses ▁no ▁prominent ▁cle av age ▁but ▁does ▁possess ▁a ▁weak ▁bas al ▁cle av age . ▁It ▁has ▁a ▁light ▁grey ▁to ▁white ▁stre ak , ▁and ▁often ▁is ▁sh iny ▁dark ▁brown ▁in ▁color . ▁Although ▁the ▁color ▁can ▁also ▁be ▁yellow ▁to ▁light ▁brown . ▁The ▁variance ▁of ▁color ▁is ▁due ▁to ▁the ▁individual ▁composition ▁to ▁the ▁min eral ▁and ▁where ▁it ▁is ▁found ▁ge olog ically . ▁It ▁has ▁a ▁relative ▁hard ness ▁of ▁ 8 - 9 ▁on ▁Moh