heart of stone

Bentonite Hills / Capitol Reef NP, Utah
Bentonite is a type of clay mineral which gives a unique many-hued color and texture to these hills. Its plastic properties cause it to become very slippery when wet.

"Moreover, I will give you a new heart and put a new spirit
within you; and I will remove the heart of stone from your
flesh and give you a heart of flesh."
Ezekiel 36:26 (NASB)

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