a hard, siliceous sedimentary rock sometimes found underlying coal beds, used in making brick for refractory linings of metallurgical furnaces
Origin of ganisterGerman dialect, dialectal ganster ; from MHG, a spark, akin to Old English gnast, spark: see gneiss
- A fine-grained quartzite used to line refractory furnaces.
- A mixture of fire clay and ground quartz, used to line metallurgical furnaces.
Origin of ganisterOrigin unknown.