Universidade de São Paulo. Faculdade de Filosofia, Letras e Ciências Humanas
Abstract
Crystals commonly tabular || c (001) occur in the place named Serrote (State of Sao Paulo) They are frequently found in the cavities of massive barite, which owes its origin probably to metasomatic processes. Occasionally the crystals exhibit distinct inclusion of microscopic needles of pyrolusite arranged in radiated orientation. Colourless when pure; yellowish and pale gree
