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|Occurrence of granite|. Granite occurs as relatively small, less than 100 km2 stock-like masses and as large batholiths often associated with orogenic mountain ranges and is frequently of great extent. Small dikes of granitic composition called aplites are associated with granite margins. rock consisting of equal proportions of orthoclase and plagioclase plus quartz may be considered a quartz monzonite. A granite containing both muscovite and biotite micas is called a binary granite.
Students of granites classify them in three or four categories. I-type (igneous) granites appear to arise from the melting of preexisting igneous rocks, S-type (sedimentary) granites from melted sedimentary rocks (or their metamorphic equivalents in both cases).y Andrew Alden. Granite is the signature rock of the continents. More than that, granite is the signature rock of the planet Earth itself. The other rocky planetsâ Mercury, Venus and Marsâare covered with basalt, as is the ocean floor on Earth.