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Aims. We present a detailed study of the Mg/Si and C/O ratios and theirimportance in determining the mineralogy of planetary companions. Methods.Using 499 solar-like stars from the HARPS sample, we determine C/O and Mg/Sielemental abundance ratios to study the nature of the possible planets formed.We separated the planetary population in low-mass planets ( < 30 $\rmM_{\odot}$) and high-mass planets ( > 30 $\rm M_{\odot}$) to test for possiblerelation with the mass. Results. We find a diversity of mineralogical ratiosthat reveal the different kinds of planetary systems that can be formed, mostof them dissimilar to our solar system. The different values of the Mg/Si andC/O ratios can determine different composition of planets formed. We found that100\% of our planetary sample present C/O < 0.8. 86\% of stars with high-masscompanions present 0.8 > C/O > 0.4, while 14\% present C/O values lower than0.4. Regarding Mg/Si, all stars with low-mass planetary companion showed valuesbetween 1 and 2, while 85% of the high-mass companion sample does. The other15\% showed Mg/Si values below 1. No stars with planets were found with Mg/Si >2. Planet hosts with low-mass companions present C/O and Mg/Si ratios similarto those found in the Sun, whereas stars with high-mass companions have lowerC/O.

C/O vs Mg/Si ratios in solar type stars: The HARPS sample