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→Variables that control ductility
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| Composition
| Composition
| Not all limestones or shales have the same ductility. Compositional variations such as total organic carbon ( <ref name=ch10r13>Chong, K., P., Hoyt, P., M., Smith, J., W., Paulsen, B., Y., 1980, Effects of strain rate on oil shale fracturing: International Journal of Rock Mechanics, vol. 17, no. 1, p. 35–43., 10., 1016/0148-9062(80)90004-2</ref> ) and clay mineralogy ( <ref name=ch10r14>Corbett, K., Friedman, M., Spang, J., 1987, Fracture development and mechanical stratigraphy of Austin Chalk, Texas: AAPG Bulletin, vol. 71, no. 1, p. 17–28.</ref> ) change ductility.
| Not all limestones or shales have the same ductility. Compositional variations such as total organic carbon<ref name=ch10r13>Chong, K., P., Hoyt, P., M., Smith, J., W., Paulsen, B., Y., 1980, Effects of strain rate on oil shale fracturing: International Journal of Rock Mechanics, vol. 17, no. 1, p. 35–43., 10., 1016/0148-9062(80)90004-2</ref> and clay mineralogy<ref name=ch10r14>Corbett, K., Friedman, M., Spang, J., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0001/0000/0017.htm Fracture development and mechanical stratigraphy of Austin Chalk, Texas: AAPG Bulletin, vol. 71, no. 1, p. 17–28.</ref> change ductility.
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| Confining pressure
| Confining pressure