This is a good example of light green datolite crystals that have grouped together in an aesthetic display. There are small pyrite crystals that are scattered across the datolite crystals. The luster of the piece is good. This piece is from Charcas, San Luis Potosi, Mexico. The overall dimensions are 8.7cm wide by 5.3 cm tall and 5.5 cm front to back. There is some bruising and nicks along the edges but it does not distract from the appearance.