Troostite

Troostite is a brownish red zinc manganese silicate mineral that is a variety of Willemite in which some of the zinc is replaced by manganese. The addition of manganese gives Troostite its brownish red color. As with Willemite, Troostite fluoresces bright green under short wave UV light and dull green under long wave UV light. The only two locations for Troostite are Franklin and Sterling Hill, New Jersey, USA.