Simple Lithology

piedra / wacke

definition Clastic sandstone with more than 10 percent matrix of indeterminate detrital or diagenetic nature. Matrix is mud size silicate minerals (clay, feldspar, quartz, rock fragments, and alteration products). more like this
example graywacke more like this
note Distinction from mudstone is based on inference that less that 50 percent of the mud size fraction (matrix) is original mud size detrital particles. May also grade into diamictite or conglomerate based on size distribution of discernible particles. If more than 50 percent of rock is detrital particles of intrabasinal orgin and carbonate composition, categorize as carbonate wackestone. Term is typically applied to diagenetically altered volcanic-lithic clastic rocks in which the definition of the original clasts has been obscured. Suggested boundaries between wacke and arenite range from 5 to 15 percent matrix. See Dickinson (1970) for discussion of interpretation of undiscernible matrix in diagenetically altered lithic clastic rocks. Dickinson, W.R., 1970, Interpreting detrital modes of graywacke and arkose: Journal of Sedimentary Petrology, v. 40, p. 695-707. more like this
source Pettijohn, Potter, Siever, 1972, Sand and Sandstone: New York, Springer Verlag, 681 p. more like this
broader clastic sandstone
narrower wacke
in scheme simplelithology
is primary topic of wacke