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Continuous wave and pulse X-band electron paramagnetic resonance spectroscopy are used to determine structure, magnetic and relaxation properties of paramagnetic centers formed by impurity ytterbium ions in forsterite (Mg2SiO4) single crystals. It is found that Yb3+ ions substitute Mg2+ ions both as single ions and as dimeric associates with nearby magnesium vacancy. For all the centers magnetic properties are characterized by the strong easy plane anisotropy.