Abstract
Abstract Shocked milky quartz from the core of a granite pegmatite occurs at Brunnvasselbodarna, about 10 km from the impact center of the Siljan ring structure. The quartz displays well-developed cleavage fractures dominantly parallel with {1011}, some of which are filled with secondary laumontite. Planar features are common, the most frequently observed are oriented parallel to {1013}, {1011}, {0001}, but {1012}, {1122}, {2131}, {2241} and {5161} are also observed. An estimate of the peak pressure of the shock wave in Brunnvasselbodarna gives ca. 16 GPa. This value is probably too high because the grain size of the pegmatite quartz is large compared to the quartz grains of the rocks for which the method used has been devised.
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