Environmental Engineering Reference
In-Depth Information
FIGURE 6.85
Quarry wall in slightly metamorphosed highpurity limestone (Cantagalo, Rio de Janeiro, Brazil). Cavities are
clay-filled and about 6 m deep and 1 to 2 m wide. Man at bottom left gives scale.
components of the mass. The depth of decomposition is relatively thin in comparison with
foliated crystalline rocks, but increases with the amount of impurities in the mass.
Sandstones
Composition minerals of sandstones are chiefly quartz grains cemented by silica, calcite,
or iron oxide that are all stable except for calcite, which is soluble. Decomposition occurs
