4. Swelling clays in a shale can provide a warning that slope stability may be a

Question

4. Swelling clays in a shale can provide a warning that slope stability may be a problem or a heaving condition may develop on wetting of the clay ES ON MINERALS pe- l to but instead has rounded fracture surfaces. What min- eral would this be and how do you account for the greatly different appearances? 3. A white mineral has a hardness of 6, two planes of cleavage nearly 90° apart, and shows striations on two of the cleavage faces. What specific mineral would this be? 4. Limestone (which consists mostly of calcite) is being

Explanation / Answer

White mineral has a hardness 6, two planes of cleavage nearly 90 degree apart is Plagioclase (Feldspar), having perfectly straight parallel stirations. Plagioclase is slightly harder than glass and have non-metallic luster.

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