Isotope dilution (ID) mass spectrometry is a primary method of analysis suited for the accurate and precise measurement of several trace elements in geological matrices. Here we present mass fractions and respective uncertainties for Cr, Cu, Ni, Sn, Sr and Zn in 10 silicate rock reference materials (BCR-2, BRP-1, BIR-1, OU-6, GSP-2, GSR-1, AGV-1, RGM-1, RGM-2 and G-3) obtained by the double ID technique and measuring the isotope ratios with an inductively coupled plasma-mass spectrometer equipped with collision cell. Test portions of the samples were dissolved by validated procedures, and no further matrix separation was applied. Addition of spikes was designed to achieve isotope ratios close to unity to minimise error magnification factors, according to the ID theory. Radiogenic ingrowth of 87Sr from the decay of 87Rb was considered in the calculation of Sr mass fractions. The mean values of our results mostly agree with reference values, considering both uncertainties at the 95% confidence level, and also with ID data published for AGV-1. Considering all results, the means of the combined uncertainties were <1% for Sr, approximately 2% for Sn and Cu, 4% for Cr and Ni and almost 6% for Zn. © 2012 The Authors. 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