Abstract
Enrichment of free mica (i.e. as monomineralic grains) in the fine fraction of crushed rock aggregates af- fects the quality of the aggregate end product. Granitoid rock from the Svecofennian Province were used as being representative of crushed rock aggregates commonly used for construction purposes. The results reveal a general trend of enrichment of mica for finer fractions. For the coarse grained rock a peak occurs at 0.25-0.5 mm followed by a decrease in the amount of free mica; for grains <0.063 mm there is an increase. The general trend and peak are corre- lated to the microstructural characteristics of the samples.
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