salband
noun
sal·band
ˈsalˌband;
ˈsälˌbänt,
ˈzäl-
plural -s
: the border of an igneous mass (such as a dike) usually characterized by a finer grain or even glassy texture produced by the chilling of the molten rock by the cold country rock
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Merriam-Webster unabridged
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