Abstract
The research described in this paper is performed on cataclastic rocks of granitic composition. The petrography is described and classified according to Higgens. All rocks appear with primary cohesion and range from cataclasite to mylonite gneiss. A crystallinity index for quartz minerals based on the degree of resolution of thed, X-ray reflection at 1.3820Åis examined. It is found that the crystallinity index corresponds fairly well with the degree of distruction/annealing in cataclastic rocks. It is concluded that the index can be used as a quantitative measure of the state of ductile deformation in cataclastic rocks. However, an attempt to explain the relationship between the abrasion value, i.e., the hardness of the rocks, and the crystallinity index as a simple linear association, failed. It is believed that this at least partly is due to the grain size distribution in the rocks which has a stronger impact upon the strength properties than the ductile deformation, causing scatter in the regression model.
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