The word you may be looking for is alunogen.
hematite
Mineral
gold
ore
Mica
Mica .
Armchair is an 8 letter word. The 7th letter is i.
mica
Tungsten.
Talc
An 8 letter word for gifts would be: presents
an 8 letter word for wealthy is ....... affluent
mariners is a 8 letter word for sailors