The phrase "block of rock" is correct and usable in written English.
It can be used to describe a solid piece of rock, often in geological or construction contexts.
Example: "The construction crew discovered a large block of rock that needed to be removed before they could proceed with the foundation."
Alternatives: "chunk of stone" or "mass of rock".
An ancient fault line, where a block of rock thrusts over another, runs parallel to 125th Street.
The New York-based pro-abortion Centre for Reproductive Rights suggests the Roe v Wade decision is like a block of rock being chipped away.
As greater and greater force is applied to a brittle substance, such as a block of rock or concrete, a point will be reached at which the internal structure can no longer sustain the applied load by elastic deformation alone.
"I was making bad weather of it, and climbing up over a lot of rocks out of a gully bottom where I had been half drowned in a stream, and getting my head to the level of a block of rock I observed right in front of my eyes, broadside on, maybe a yard off, certainly not more, a big leopard.
Longwood House, where Napoleon lived, gardened, plotted and died, is also part of France, and Betsy and others vividly describe its humidity, ceaseless wind (the island's turbine farm is just a few hundred metres down the road these days from Longwood), and the massive block of rock, called the Barn, which cramped the view of the sea to the east.
Seismologists say many of the quakes in the UK are clustered around an enormous block of rock known as the Midlands Microcraton.
It's a weirdo wonderful block of rocks, the most complicated mountain range in North America.
The products of dimension stone quarries are prismatic blocks of rock such as marble, granite, limestone, sandstone, and slate.
Tillites typically consist of poorly sorted angular and subangular, polished and striated blocks of rock floating in an unstratified clay matrix.
Pictures from Everest's south side base camp showed flattened tents and blocks of rock scattered around a site deep in snow.
Most gem-quality diamonds are 1 billion to 3.5 billion years old, and originate at shallower depths, in the keels beneath the cratons, the ancient blocks of rock that form the hearts of the earth's continental masses.
