Modulus of Rupture of Common Rocks

The modulus of rupture (MOR) is a measure of the strength of a material, specifically in the context of rocks. It represents the maximum stress a material can withstand without breaking under bending or flexural loading.

The following table provides a curated list of modulus of rupture values for different types of rocks at room temperature (approximately 20°C or 68°F).

Click on the icon to switch between SI (MPa) and US customary/Imperial (psi) units.

Modulus of Rupture of Common Rocks
Basalt14 - 55
Diorite14 - 55
Gabbro14 - 55
Gneiss8.3 - 21.4
Granite10 - 20
Limestone (hard)7.4 - 12
Marble9.8 - 19.6
Quartzite8 - 31
Sandstone (hard)12
Sandstone (medium)5
Sandstone (soft)2.5
Shale2 - 50
Slate34 - 110
Related Tables
References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018.