ASTROITES

ASTROITES, or Lapis Astroites, in Natural History, a Kind of figured Stone, found in divers Parts, and particularly in the North of England. See FIGURED-STONE.

The Form thereof is very uniform and regular; consisting of several thin pentagonal Joints set one over another, so as to form a Kind of five-angled Column.—The usual Figures, as given by Dr. Lister, are represented in Tab. Nat. History, Fig. 14.

These Stones, as now found, are all Fragments, consisting of from 1 to 25 Joints—The Matter or Substance thereof when broken, is Flint-like, of a dark shining Politure, but much softer, and easily corroded by an acid Menstruum.—They effervesce, like the Cornu Ammonis, in Vinegar; but a stronger Spirit, as of Nitre, agitates them with some Violence.