The representative organizations of the sector of ornamental rocks had looked the Commission of Nuclear Energy by means of the Center of Mineral Technology Espirito Santo (CETEM-ES) requesting aid how much the evaluation of levels of radiation in Brazilian ornamental rocks, exported to U.S.A. for use as material coverings in residences. Exhalation of radon (Rn) from these exotic granites may ex...

Thin-section petrography is a crucial tool for the study of archaeological ceramics, and in recent years, image analysis has emerged as a powerful quantitative enhancement of that tool. Exploratory applications of image analysis to archaeological ceramic thin sections, and related work by sedimentary geologists, have indicated its usefulness to the field. In this paper, we first present the res...

Introduction: Impact cratering is one of the dominant geologic processes affecting asteroids. It results in shock-induced melting and the formation of impactites, including impact melt breccias. Meteoritic samples of these breccias possess petrologic and geochemical signatures that can be used to deduce the collisional evolution of the respective parent body, such as the timing of the event, sh...