"Celestite" from Celestite is strontium sulfate. The name is derived from the word, celestial, referring to its faint blue color. Photo is copyright free for non-commercial educational uses. Just credit photo to R.
In Western Culture, the color purple is a symbol of wealth and royalty. People that rule places are often seen wearing the color purple. It is sometimes seen as artificial because it isn't often seen in nature. Purple is also the color of mourning widows