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"rock hard" is a correct and usable phrase in written English.
You can use it to describe something that is very strong, durable, or solid. For example: "The ground was rock hard after the long, hot summer."
Dictionary
rock hard
adjective
As tough, hard, or inflexible as a piece of rock.
synonyms
Exact(39)
The couch was rock hard.
It's rock hard.
No, Rock Hard Gym is a dump.
His stomach was rock hard.
I become a rock, hard and speckled.
Rock, hard place and even harder place.
Similar(21)
Those are amorphous concepts, not rock-hard missions.
The rock-hard pear.
Rock-hard ablatives in 259 pages.
'They wanted their music rock-hard.
I'm a rock-hard little bastard.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com