A snowy-white cat is actually fairly common. Many breeds can turn out in white, which is determined by genetics. Persians, Siamese, Turkish Angora can commonly be white (or another tone). The colouration occurs when a cat is born with little or no melanin pigmentation - about 5% of the cat population. What is even more rare? A chocolate brown cat (the rarest), followed by cinnamon, fawn, or lilac!