r. J. Mullis is the head of the fluid inclusion research laboratory of the Institute of Mineralogy and Petrographiy of the University of Basel in Switzerland. He is internationally recognized as one of the leading figures in fluid inclusion research in combination with geodynamic modelling. Joint profects of Dr. J. Mullis with Dr. A. Peretti and GRS GemResearch Swisslab include the determination of composition, origin and formation conditions of the mineralizing fluids in rubies and sapphires as well as the discrimination of synthetic rubies and sapphires from their natural counterparts by detailed gemmological and fluid inclusion studies (see Joint publications).
Joint publication
Peretti A., Mullis J., Mouaward F. (1996): The role of fluorine in the formation of color zoning in rubies from Mong Hsu, Myanmar (Burma). J. Gemm., 25, 1, pp. 3-19 Mullis J., Dubessy J., Poty B., O'Neil J. (1994) Fluid regimes during late stages of a continental collision: Physical, chemical, and stable isotope measurements of fluid inclusions in fissure quartz from a geotraverse through the Central Alps, Switzerland // Geochim. Cosmochim. Acta, Vol. 58, No. 10, pp. 2239-2267 Mullis J. (1987) Fluid inclusion studies during very low-grade metamorphism // In: Low Temperature Metamorphism (ed. M.Frey), pp. 162-169, Blackie Mullis J. (1979) The system methane-water as a geologic thermometer and barometer from the external part of the Central Alps // Bull. Minéral., 102, 526-536 Mullis J. (1975) Growth conditions of quartz crystals from Val d'Illiez (Valais, Switzerland) // Schweiz. Mineral. Petrogr. Mitt., 55, 419-430 Peretti A., Dubessy J., Mullis J., Frost B.R. and Trommsdorff V. (1992): Highly reducing conditions during Alpine metamorphism of the Malenco peridotite (Sondrio, northern Italy) indicated by mineral paragenesis and H2 in fluid inclusions. Contributions to Mineralogy and Petrology, 112: 329 - 340