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We present a survey of >4,000 star compositions from the Hypatia Catalog toexamine whether rocky exoplanets (i.e., those with rocky surfaces, dominated bysilicates) might be geologically similar to Earth, at least with respect tocomposition and mineralogy. To do so, we explore the variety of reportedstellar compositions to then determine a possible range of exoplanetary mantlemineralogies. We find that exoplanetary mantles will likely be dominated byolivine and/or orthopyroxene, depending upon Fe partitioning during coreformation. Some exoplanets may be magnesiowustite- or quartz-saturated, and wepresent a new classification scheme based on the weight $\%$ ratio(FeO+MgO)/SiO$_{2}$, to differentiate rock types. But wholly exoticmineralogies should be rare to absent. We find that half or more of the rangeof exoplanet mantle mineralogy is controlled by core formation, which we modelusing $\alpha_{Fe}$ = $Fe^{BSP}$/$Fe^{BP}$, where $Fe^{BSP}$ is Fe in a BulkSilicate Planet (bulk planet, minus core), on a cation weight $\%$ basis(elemental weight proportions, absent anions) and $Fe^{BP}$ is the cationweight $\%$ of Fe for a Bulk Planet. In our solar system, $\alpha_{Fe}$ variesfrom 0 (Mercury) to about 0.54 (Mars). Remaining variations in exoplanet mantlemineralogy result from non-trivial variations in star compositions. Our majoroxide analysis also verifies earlier, isotopic studies indicating that Earth isnon-solar (non-chondritic). We also find that major oxide estimates for Earth'smantle appear to preclude a hidden component in the deep mantle that wouldallow for a bulk solar/chondritic Earth. If it did exist, such a hiddencomponent must comprise at least 28% of the mass of the total mantle (to avoidnegative concentrations of some oxides) and would not look anything like thesources of ocean island or mid-ocean ridge basalts.

The Composition and Mineralogy of Rocky Exoplanets: A Survey of >4,000 Stars from the Hypatia Catalog