- Anhydrite with Pyrite
- Campiano Mine, Montieri, Grosseto Province, Tuscany, Italy
- Small Cabinet, 7.4 x 6.7 x 4.0 cm
- Ex. Kay Robertson
A choice cluster of bladed Anhydrite crystals from the Campiano Mine in Tuscany (probably from finds in the 1970s). The largest crystal is 3.5 cm. The Anhydrites have a fine, pearlescent luster that simply cannot be captured adequately in the photos, and actually best seen on the contacted and cleaved ends of the piece. What really makes the piece, though, is the dusting of lustrous, metallic Pyrites. Not only do they grow in rows, but the Pyrites always occur on one side of the Anhydrite blades, creating yet another fine example of the endlessly fascinating phenomenon called preferential growth. This is certainly one of the nicer Campiano Anhydrite specimens I have seen in recent years, with this unusual and aesthetic combination.