At first glance this looks like a cluster of quartz crystals (!)… these are super pseudo-hexagonal stronitanite crystals. The crystals are lustrous and sharp, translucent to transparent. In very good condition overall, there are a few missing tips. Stands perfectly for display as photographed. These are great strontianite crystals.
About these Strontianites
These strontianites are from the collection of Franz Lammer (1914-1997), and were collected during the period approximately 1967-1992. Although strontianite is a relatively common mineral, it is difficult to obtain fine collection specimens of sharp crystals. Among the finest ever found are the specimens that came from the magnesite deposit at Oberdorf an der Laming, Styria, Austria, a locality that has produced superb crystals of a few different habits.