In the pure state it is white and infusible, and will not melt with the carbonate of soda.
It becomes white in the pottery kiln, and is infusible at that heat.
It does not conduct electricity well, like other metals; it is infusible; its specific gravity is unknown.
All diamonds are infusible and unaffected by acids or alkali.
infusible at the blow-pipe, and effervesces but slightly when fused with glass of borax.
infusible, in-fūz′i-bl, adj. that cannot be dissolved or melted.
The alumina is infusible, the boron is fusible, but boron cannot be used in a raw glaze for reasons to be presently explained.
The earths are not volatile, and, in the pure state, are infusible.
It can be readily cut with a knife, and is infusible in any ordinary furnace heat.
The most of its compounds are infusible, and yield water by distillation.