I'm a captured tooth nerve
amalgam appeased
restrained in containment
by my keeper
then I can be a prisoner
escaping the jail
my warder has lost
the keys of control
on dark days
my fathoms swirl
in murky mass
infused with blinding kelp
on good days
my porthole shows
clearness of eye
the glass reflects well
just to confuse
my ores composition
is misunderstood
the translation
metamorphic
changing
minute by minute
hour by hour
these ones are buggers
my microscope
isn't good with definition
will I or wont I
who knows
my borders are contested
being diplomatic
I make pacts and treaties
no monicker is required
the tried and tested
gentleman's agreement
that will do  
my margins
can be thick or thin
comments fit in
usually they range
between
insult and praise
depending on the mood
I oft go to open cut mines
to find common minerals
which are useful on a daily basis
real effort is called for
when I delve into deep shafts
sometimes gems are quarried
precious ones to behold
well enough said
a letter is to be written
dear meditative home
we're returning soon
if we're delayed
after hours
p.s. leave the porch light on