Bort and Sealed

My favourite carbonado

A superior grinding grit

In pursuit of level pegging

Ingrained beneath the split

Bringing up a polished hue

Slipping sliding with effect

To the nearest nanometre

Of a microscope inspect

Enduring to a diamond shine

As near perfection one may get

When looking at the final finish

A crowning glory coronet

BORT or BOART

English Word of the Day from
Oxford Dictionaries 28^thOctober 2018