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sinter

(Science: chemical) 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.

Origin: G. Cf. Cinder.