What is the tensile strength of marble?

Tensile Strength, Ultimate 7.00 - 20.0 MPa 1020 - 2900 psi

This is the strength in a pure tension test. For bending use:

Modulus of Rupture 0.00410 - 0.0276 GPa 0.595 - 4.00 ksi

source: http://www.matweb.com/search/DataSheet.aspx?MatID=211&ckck=1