Based on spectrochemical determinations of Ba and Sr in about 70 microcline samples collected from roughly 75m² of the surface of a pegmatite body, the distribution of these elements within the pegmatite and within single microcline crystals is discussed. This distribution is very far from uniform, and no sign of subsequent adjustment towards an even distribution is observed. The different crystal chemical characters of Ba an d Sr are strikingly apparent. The accuracy of spectrochemical Ba- and Sr-determin ations is briefly considered.