Sin″ter (?), n. [G. Cf. Cinder.] (Min.) Dross, as of iron; the scale which files from iron when hammered; — applied as a name to various minerals.
Calcareous sinter, a loose banded variety of calcite formed by deposition from lime-bearing waters; calcareous tufa; travertine. — Ceraunian sinter, fulgurite. — Siliceous sinter, a light cellular or fibrous opal; especially, geyserite (see Geyserite). It has often a pearly luster, and is then called pearl sinter.