They are bounded back and front by partitions of pure resin, without any encrustations of mineral particles.
The encrustations seemed not so white and the colorings of the water had lost some of their prismatic variety and perfection.
Crystals are minute and capillary and rarely met with, the mineral occurring usually as soft earthy masses and encrustations.
Encrustations of lime formed on the floor of caverns which are hollowed out of limestone.
With frantic fingers I felt those circular walls, thick with the encrustations and slime of ages.
These encrustations can usually be removed after they have been soaked with vinegar for a few hours.