Abrasion

I used to be limestone

And you were hewn from a coarse-grained granite

Our friction made me smooth

You shaped me into something quite special

That sparkled in sunlight

But when my edges started to crumble

I questioned your firmness

So unyielding and unwilling to change

You left me with no choice

Except to alter my composition

Of course you followed suit

Till our iron wills were evenly matched

Now we're two types of quartz

That keep crashing into one another

Wearing each other down

Wondering will the other break apart

But what if no one does?

Striking stones together generates heat

And then a spark ignites

Will it become a fire of refinement

Making us both stronger

Or will it bring us to our melting points?

I suppose time will tell