The increase in volume of certain substances when they are heated (often accompanied by release of water)
1 Before the blowpipe the mineral readily fuses with intumescence to a colourless glass.
2 Notice whether the substance fuses with the bead, and if so, whether there is intumescence or not.
3 If intumescence takes place, the presence of either tartaric acid, molybdic acid, silicic, or tungstic acid, is indicated.
4 Stilbite is characterized by its form, difficult gelatinizing, and intumescence before the blowpipe; from natrolite as mentioned under that species.
5 The silicates of lime are moreover frequently characterized by intumescence or ebullition, when heated in the forceps in the blowpipe flame.
6 Here, an intumescence which was to become a mountain, there, an abyss which was to be filled with an ocean or a sea.
7 We observe hillocks and intumescences caused by the action of the elastic vapours, cones of broken scoriae and ashes which cover the funnels.
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