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Amphibolite, meta-gabbro or schist are among the rock types used for construction purposes. Generally selected depending on the availability and the mechanical characteristics, a deeper information about the properties of aggregates could optimize their use. Although some efforts have been made e. g., trying to include some limitation to the mineralogy, the evaluation of other relevant properties such as the grain structure are still overlooked. Thus, this paper aims to expose the missing link between petrological characteristics of the rocks and their possible applications in the construction field, attempting to improve the dialogue between specialists and producers. [ABSTRACT FROM AUTHOR]