Significados de hard quartz en inglés

For hard quartz the size should be increased by at least 6 inches.

We want drills and powder, as picks are no sort of good on this hard quartz.

They are drilling shot holes in the quartz reef prior to blasting to break up the hard quartz.

Still, it is strange that this hard quartz has in all cases a good- natured way with it, of yielding to everything else.

We may believe that the jagged and battered forms of the hard quartz yet show the effects of the waves of an open ocean.

Although most of the gold occurs loose, amongst the soft portions of the lode, the hard quartz also contains it disseminated in minute grains throughout.