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However, a recent publication by RoblesCruz et al. (2008) states the presence of a secondary Mg-ilmenite, replacing an early intercumulus Fe-rich ilmenite in the Catoca diamondiferous kimberlite (Angola). As a result, routine chemical analyses on mineral concentrates of ilmenite do not seem to be suitable for determining the diamond grades in this pipe, unless textural observations are considered.

Use of indicator minerals in diamond exploration: a comparison between barren and fertile kimberlites in Angola