incrustation

From close up the "lake" is a glistening incrustation of blue-green glass 2,400 ft. in diameter, formed when the molten soil solidified in air.

From Time Magazine Archive

The effect, twinkling and blazing under the museum lights, is of quite breathtaking intensity: the gold and silver may be only foil, but they go beyond rococo incrustation into a domain of absolute theatricality.

From Time Magazine Archive

And at such moments, Citizen Judges, everything personal, all the personal incrustation, all rancor, pride and a number of other things, fall away, disappear.

From Time Magazine Archive

At dawn on the 20th the masts and cordage showed a thick incrustation of salt, thus giving unmistakable evidence of the great height to which the spray had been driven.

From Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume II (Commodore B. Von Wullerstorf-Urbair,) Undertaken by Order of the Imperial Government in the Years 1857, 1858, & 1859, Under the Immediate Auspices of His I. and R. Highness the Archduke Ferdinand Maximilian, Commander-In-Chief of the Austrian Navy. by Karl Ritter von Scherzer

Zaratite, zar′a-tīt, n. a hydrous carbonate of nickel, found usually as an incrustation on chromite.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various