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Fragmentation of rocks upon impact is a complex phenomenon that is not well understood. The first question to answer to adequately model fragmentation is whether a falling block is likely to fragment at impact or not. This question can be answered if the survival probability of the rock is known, but this is not trivial as no model or method exists to predict the survival probability of natural rocks. The authors have recently developed a model that can predict the survival probability of brittle rocks under collinear impact, following a preliminary breakthrough for brittle spheres. One complexity associated with irregularly shaped rocks is the possibility of non-collinear or eccentric impacts. The objective of this study is to conduct drop tests on irregularly shaped rocks and highlight the significance of collinear and eccentric impacts on the survival probability in drop tests.