Fluorite     Cave- In- Rock, Illinois. Light purple cubes to 2 cm on edge coat two sides of this partial dome. Minor overgrowths. Excellent condition except for a cleaved area on back.  Good views from a couple of different ways. 12 x 7 x 7 cm overall. Stepped growth on transparent cubes.  Some residual hydrocarbons.  This material has become very difficult to find art reasonable prices.    $250