fissility

From fissile +‎ -ity.

fissility (usually uncountable, plural fissilities)

1. The quality of being fissile (in any sense).
2. (geology) The property of mudstones to split along layers, more or less parallel to the plane of bedding, thus becoming described as shales.

• foliation

• “fissility”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.