The "brittle-like cat" you describe may refer to a cat with particularly black fur. The fur of this cat is very dark and looks like small black briquettes. This cat may belong to multiple breeds, as the characteristic black coat appears in many cat breeds.

Among them, the Bombay cat is a cat breed characterized by black hair. Their coats are black and shiny, just like the black panthers of India. They are medium or slightly larger in stature, but have strong muscles and are of moderate weight. The Bombay cat is also very gentle, intelligent, curious, likes to be with people, and has rich emotions. It is an ideal pet cat.

In addition, black British Shorthair, black Ragdoll and other breeds may also have individuals similar to "little briquettes". These cats' black coats may have a different sheen and texture, but are equally impressive.