Fibrous attapulgite-palygorskite, with fibers generally measuring several millimeters in length, is found associated with calcite in hydrothermally deposited veins. The veins represent frac ture filling in a shear zone through Triassic siltstone (Brunswick Formation) near Limerick, Pennsylvania. Heretofore attapulgite-palygorskite has been known to occur only in the form of microcrystalline to cryptocrystalline aggregates. The macrocrystalline character of this occurrence is attributed to recrystallization that took place during an episode of mild deformation or slippage along the vein contacts.

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