A note by Jackson and Ross (1956) describes a rapid method of modal analysis for rocks with grain sizes ranging from about 3 to 10 mm. In this paper, an analogous method of modal analysis is described which applies to the more commonly encountered rocks with grain sizes ranging from 0.1 to 5 mm. The method can be used to supplement, though not replace, the use of thin sections for obtaining quantitative bulk compositions of essentially structureless rocks.

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