They're a bluish grey, search "Russian Blue" on Google and click on image resalts to see blue cats.
The Scientific name for all breeds of Domestic cat is Felis catus.
There are varieties of cat breeds that are called 'blue' e.g. the Blue-Pointed Siamese but these are not what you would call a true blue colour. see the link I will post below.
Please check this video for the list of 120+ cat breeds with related videos, images and brief description by the Cat Facts Channel. Search on Youtube with the below terms: Cats and Cat Breeds; List of 120 Breeds with Details #bestcatbreedforfamiles Hope this will be helpful.
There is no such thing as a "pure-bred" black cat. "Black" is just a coat colour, just like "white", "blue", brown" or "red" (orange/ginger). They are not breeds or species. Black is a common coat colour found in many different breeds.
Google for "cat breeds". There is thousands. Like Ragdoll and Persian for example.
There are more than 5 cat breeds, but 5 can be the siamese, the manx, the bambino, the angora, and the russian blue.
Typically, the Persian looks more like a Siberian husky than other cat breeds. This is due to its blue eyes and fur that ranges from sold white to light brown.
It most likely that your cat passed the gene down(the gene must be recessive). It may be a breed of cat, like Russian Blue or a Blue Tabby.Also may want to check out cat color information:http://fanciers.com/other-faqs/colors.htmlInformantion on the Russian Blue Cat:http://www.cfainc.org/breeds/profiles/articles/russian.htmlhttp://www.russianblue.info/
Normally this would be a Siamese although breeds DO get crossed....
Brown cats usually come in tabby types. There can be dark brown, which is like a very dark orange, or a pale brown, which is a little like cream color, which is like the normal color of a Siamese cat. The only kind of cat that can have blue eyes are white cats. If there is a white cat with blue eyes, he/she can be blind, deaf or both. Siamese cats can also have blue eyes. Those are the only two breeds that Vicki and I, the vets, know of with blue eyes.
No dog is part cat although breeds like the Tibetan Spaniel may resemble a cat.
Among domestic breeds, Siamese, Angora, Persian, Assyrian, Bengal, Manx, Himalayan,domestic Shorthair, Maltese, Russian Blue..There are many other breeds..Check out Cat Fanciers Society website.