Once can find a black chinchilla advertised for sale in many places, so one would think that black chinchillas are somewhat common. The problem is, while the term black chinchilla is quite specific, from the point of view of the chinchilla, there is no such thing as a purely black chinchilla.Black Is Not Pure Black – In the first place, those chinchillas called black chinchillas almost always have a white belly. So as black as the rest of their fur may be, they are not pure black. Secondly, there are two color types that are involved. One is the Black Velvet chinchilla which is widely sought after, and often simply referred to as a black chinchilla.