Friable
From PLANTFACTS.OSU.EDU
1. Easily crumbled in the fingers; non-plastic.

Friable grains are not well-cemented to each other and can be broken apart in your hands.
Source: http://www.geomore.com/sandstones.htm
1. Easily crumbled in the fingers; non-plastic.

Friable grains are not well-cemented to each other and can be broken apart in your hands.
Source: http://www.geomore.com/sandstones.htm