It is a large pool of dark blue water enclosed by black rocks, and encrusted with sinter.
Muffle furnaces are suitable for fine ores which are liable to decrepitate or sinter.
The springs are surrounded by sinter, terraces, and basins in which sick people bathe.
We proceeded at first over a quantity of sinter debris, and then through some hummocky land.
sinter, sin′tėr, n. a name given to rocks precipitated in a crystalline form from mineral waters.