Creedite is a calcium aluminum sulfate fluoro hydroxide mineral. Ca3Al2SO4(F,OH) 10 Often occuring as acicular radiating sprays. Creedite usually froms from the oxidation of fluorite deposits. Creedite may be colorless, white, yellowish, orange, blue, blue-violet. The orangish is often rust stained like the specimens we have from the Navidad Mine Rodeo Dorango, Mexico.