This is a thumbnail-sized specimen featuring delicate lilac colour zones, visible through the termination. One large face of the termination is a cleavage face and the specimen is priced accordingly. Because the termination face and the cleavage plane are the same angle, it is really hard to tell casually – you need to examine it closely to see, but with magnification you can see it. Even so, this is just a remarkable anhydrite specimen. The crystal form is excellent, and the colour zoning is very sharply defined in distinct triangular zones. Very cool.
About these Anhydrite/Probertite Specimens
These excellent specimens of anhydrite and probertite were found in a pocket at the Kohnstein Quarry, Niedersachswerfen, Nordhausen, Harz, Thuringia, Germany. The anhydrite crystals are amazing – euhedral, very pale lilac, translucent to transparent. I am told that although they are encountered at this locality once in a while, this is only the third time in the last 30 years, so it is not a common occurrence.
Anhydrite is one of those common minerals that is incredibly hard to obtain in display specimens, other than the relatively common light blue Mexican anhydrite fans. Euhedral, well developed crystals of any decent size are rare.
Probertite is a relatively rare borate mineral that occurs as transparent, colourless, heavily striated, lustrous crystals. Atother world localities it usually occurs as radiating aggregates of acicular or columnar crystals, coarser crystal aggregates are uncommon and euhedral terminated crystals much more so.