White buffalo is often called turquoise, when in fact it has been tested many times and it is not turquoise. The name is used to identify a stone from the Tonopah, Nevada mine owned by the Otteson family. The white stone is surrounded by black and brown flint-like chert, an opaque variety of quartz. Another stone, dyed howlite is also black and white but with less vivid colors than white buffalo and is often called white buffalo turquoise as well. The stone has become somewhat rare and is still very much sought after.