White Buffalo Stone (Sacred Buffalo Stone, White Turquoise) is white with black and brown inclusions.
It is sometimes called “white turquoise” but by definition turquoise contains copper (it is a copper aluminum phosphate), which is what gives the characteristic blue color. Presence of iron will shift the color toward green.
Although White Buffalo Stone is as hard as turquoise and polishes to a high shine, it has no copper and no blue color, so is technically not turquoise. As far as we know, White Buffalo Stone comes from only one mine in Nevada, which is owned by the Otteson family. (See links below for more information on the family and the mine.)
Note: Howlite is commonly passed off as White Buffalo Stone. Howlite is a white to milky stone with charcoal colored spiderweb type veins. Howlite is more porous than White Buffalo Stone. It is often dyed to look like turquoise.