Degradation of Strength and Stiffness of Sandstones Caused by Wetting-Drying Cycles: The Role of Mineral Composition

Table 1

Mineral constituents of the three sandstones.

Mineral		Mass percentage (%)
		S1	S2	S3
Quartz		57.20	44.94	63.39
Feldspar		13.48	28.71	29.09
Calcite		5.26	17.36	1.79
Hematite		6.45	5.35	1.07
Mica		3.84	1.61	2.21
Clay	Smectite	9.72	0	0
	Chlorite	4.05	2.03	0
	Clinochlore	0	0	<1