s ▁relative ▁hard ness ▁scale . ▁ ▁Str ucture ▁ ▁Fer ron iger ite - 2 N 1 S ▁cry st all izes ▁in ▁the ▁trig onal ▁ 2 / m ▁cry stal ▁class ▁and ▁a ▁space ▁group ▁of ▁P m 1 . ▁It ▁exhib its ▁two ▁types ▁of ▁close ▁pack ▁structures : ▁cub ic ▁close ▁pack ed ▁and ▁hex ag onal ▁close ▁pack ed . ▁This ▁results ▁in ▁fer ron iger ite - 2 N 1 S ▁looking ▁like ▁simple ▁hex ag onal ▁pl ates . ▁ ▁Ge olog ic ▁occurrence ▁ ▁Fer ron iger ite - 2 N 1 S ▁has ▁been ▁found ▁to ▁be ▁associated ▁with ▁P rec amb rian ▁sch ists , ▁g ne isses , ▁and ▁gran ites , ▁in ▁the ▁Ts om ts a ub ▁tin ▁mine ▁in ▁the ▁Eg be ▁District , ▁Kab ba ▁Prov ence ▁in ▁central ▁Niger ia . ▁ ▁It ▁is ▁generally ▁associated ▁with ▁micro cl ine - qu art z - p eg mat ites ▁in ▁small ▁amounts ▁and ▁limited ▁in ▁association ▁only ▁to ▁that ▁of ▁old ▁gran ite , ▁sh ists , ▁and ▁g ness es . ▁It ▁is ▁also ▁associated ▁with ▁micro cl ine - qu art z - m ica - p eg m ities , ▁which ▁make ▁up ▁to ▁bulk ▁of ▁econom ically ▁advantage ous ▁depos its ▁of ▁c ass iter ite ▁where ▁Fer ron iger ite - 2 N 1 S ▁is ▁found ▁in ▁association . ▁The ▁most ▁common ▁ge olog ic ▁structure ▁where ▁it ▁is ▁present