Fluorapatite with Hyalite Opal
Cerro de Mercado Mine, Durango Mun., Durango, Mexico
Miniature, 4.8 x 3.8 x 3.2 cm
Ex. Ruben Avila

This famous old locality for superb fluorapatite specimens, still produces crystals like this 4.4 cm glassy and translucent, yellow green gem. However, the association with opal is very rare! The termination is partly obscured by grayish pink hyalite opal, that fluoresces under ultraviolet light - what a weird and pretty combination!