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Definition of intermediate

1. A secondary or auxiliary horizontal passage driven between levels in a mine, which may extend from a raise or stope and, depending upon its orientation, may be either an intermediate drift or a crosscut.

Synonym of: sublevel

2. Said of an igneous rock with a silica content between 52 and 63 weight-%
(IUGS recommendation for the classification of igneous rocks)

3. Said of an igneous rock that is transitional between basic and silicic (or between mafic and felsic), generally having a silica content of 54% to 65%; e.g., syenite and diorite. 'Intermediate' is one subdivision of a widely used system for classifying igneous rocks on the basis of their silica content; the other subdivisions are acidic, basic, and ultrabasic.

Synonym of: mediosilicic
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