the number of compoundings per year

Ful foule ys þat forreyne Þat ys comoun for al certeyne.

Which durſt with horſes hoofs that beat the ground / And Martial brass bely the thunders ſound.

The explanation of the not infrequent pairs of hemispherical concretionary masses with polished cross-sections might lie in the miners carefully extracting the rounded and bulbous masses of fluorite projecting from vugh linings.