Mn

Manganese has always been
my favorite elemental sound. 

My memory failed
atomic number 
(twenty five)

and other properties
(silvery, brittle,
hard, metal).

Run me through
the stoichiometry enough
and I become a gear shifter
automatic

dwelling and drilling
like a residential oil rig
taking from the ground

all the sound
manganese might offer
to a poet's ear.