The “Giallo San Giacomo” represents a granite variety of dimension stone quarried in northern Sardinia, which recently acquired large appreciation because of its rare yellowish colour. Field survey and characterization data-set documented in the pluton a diffuse microcracks network which decreases near the contacts and disappear in the host granitic rocks. This micro-crack network favours a pervasive water infiltration and promote weathering effect such as diffusion of iron oxi-hydroxides which, locally, can precipitate and resealed the micro-fractures. This mechanism account for yellowish colour and the unexpectedly high values of measured uniaxial compressive strength (UCS) in the analysed samples.
Il Giallo San Giacomo: un granito alterato come lapideo ornamentale
Naitza S.;
2018-01-01
Abstract
The “Giallo San Giacomo” represents a granite variety of dimension stone quarried in northern Sardinia, which recently acquired large appreciation because of its rare yellowish colour. Field survey and characterization data-set documented in the pluton a diffuse microcracks network which decreases near the contacts and disappear in the host granitic rocks. This micro-crack network favours a pervasive water infiltration and promote weathering effect such as diffusion of iron oxi-hydroxides which, locally, can precipitate and resealed the micro-fractures. This mechanism account for yellowish colour and the unexpectedly high values of measured uniaxial compressive strength (UCS) in the analysed samples.
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