The texture of mineral particle is the key point to the mechanical property of rocks. Two kinds of marbles are uniaxial and triaxial compressed. One is slightly weathered with fine-crystal in size of 0.5mm～1mm

the other is weathered with silt-crystal in size of 0.2mm～0.5mm. The silt-crystal marble has much internal boundary to slip during compressing

so the Young’s modulus willbe changed greatly with the cohesion

and the dispersion of Young’s modulus is greater than that of strength. On the other hand

the fine-particle marble is 3 times in Young’s modulus but only 20% in uniaxial strength more than the silt-particle marble. In pseudo-triaxial compression

the Young’s modulus increases with confining pressure for silt-crystal marble

but it is nearly the same as fine-crystal marble. The triaxial strengths of the two marbles in ductile deformation are closed each other. The angle of shear failure increases with the confining pressure and finally reaches the value from Coulomb criterion The supporting capacity of marble specimen is only related to the confining pressure and no matter with the loading path

material strength and flaws. The internal friction between crystals determines the strength and deformation of marble.