What is "boart"

Usage examples of "boart".

The quotas were broken down by carat weight into the different types of stones, from dark industrial boart to the finest gem quality, and by size from the tiny crystals of ten points and smaller to the big valuable stones.

Satisfied with the weight, he opened the drawer of the desk and brought out a cheap glass-cutter, shaped like a pen, but with a sharp chip of boart, the black industrialgrade diamond, set in the tip.

To illustrate the point he drew the stylus of boart across the glass top of the desk.

Why don't you co and glup the bresidents that insoalt your lawss, and gick your Boart of Arpidration out-of-toors?

The little stuff under a carat in weight, or the industrial black diamond and boart would not be visible on the table.

At first Zouga had thought it to be black boart, the almost worthless industrial diamond.