Technological analysis of Cerro do Sandi and Bela Vista granites, Piratini-RS, Brazil, for use as ornamental rocks

Abstract

Cerro do Sandi and Bela Vista granites occur in the Piratini region and belong to Dom Feliciano Suite. This suite is the most recent magmatic episode of the Pelotas batholith construction. The granitic massifs have elongate forms along NE-SW direction and constitute a positive relief of aligned crysts. Mapping of geological, structural and superficial deposits indicated the presence of outcrops and areas dominated by boulders with potential for exploration of blocks for dimensional stones. Petrography and technological essays confirmed favorable results to this utilization. Bela Vista Granite presents high mechanical resistance and low abrasion, qualities that recommended its utilization as external and internal covering. Cerro do Sandi Granite showed physical indexes and ultrasonic propagation velocity characteristic of rocks without weathering alteration. However, in the alterability essay this granite showed incipient modification of color and minimal loss of material. These characteristics limit the utilization of this granite as external and internal floor.