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Journal Article

Amethyst geodes in the basaltic flow from Triz quarry at Ametista do Sul (Rio Grande do Sul, Brazil): magmatic source of silica for the amethyst crystallizations

DOMINIQUE PROUST, CLAUDE FONTAINE
Published: 01 July 2007
Geological Magazine (2007) 144 (4): 731–739.
DOI: https://doi.org/10.1017/S0016756807003457
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Amethyst-bearing lava flows in the Paraná Basin (Rio Grande do Sul, Brazil): cooling, vesiculation and formation of the geodic cavities

DOMINIQUE PROUST, CLAUDE FONTAINE
Published: 01 January 2007
Geological Magazine (2007) 144 (1): 53–65.
DOI: https://doi.org/10.1017/S001675680600269X
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CLAY MINERALOGY AND CHEMICAL COMPOSITION OF BENTONITES FROM THE GOUROUGOU VOLCANIC MASSIF (NORTHEAST MOROCCO)

Mohamed Ddani, Alain Meunier, Mohamed Zahraoui, Daniel Beaufort, Mohamed El Wartiti, Claude Fontaine, Boubker Boukili, Benacer El Mahi
Published: 01 June 2005
Clays and Clay Minerals (2005) 53 (3): 250–267.
DOI: https://doi.org/10.1346/CCMN.2005.0530305
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