Is the sentence correct ?-"The 2,200-year-old Great Wall was originally built of mud, and not even mud brick."
or
"The 2,200-year-old Great Wall was originally built of mud, not even mud bricks." is better?
"Mud brick" is the building material. "Mud bricks" is the individual objects. A wall can be built of stone or stones, glass block or glass blocks, depending on what you want to say about it.
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"Mud brick" is the building material. "Mud bricks" is the individual objects. A wall can be built of stone or stones, glass block or glass blocks, depending on what you want to say about it. In your case, "mud" is the other building material, so it is better to stay consistent for the reader's sake and use "mud brick".