Rocks like this may look solid and uniform, but have a small scale fabric, usually from alignment of platy mineral grains (such as clays), that represent planes of weakness. Create a crack in the right direction, propagate it a bit, and it breaks cleanly apart. https://t.co/uT6NwQKtDq
— Mark Tingay (@CriticalStress_) July 30, 2020
via Twitter https://twitter.com/CriticalStress_
July 30, 2020 at 08:11AM
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