Specimen consisting of pearly white masses of hydrotalcite and yellowish green lizardite, a serpentine group mineral.
From the type locality of hydrotalcite "Dypingdal Serpentine-magnesite deposit, Snarum, Modum, Buskerud, Norway".

From old Dr, Krantz stock, comes with on-glued antique label dated 19th century, unfortunately trimmed but definitly with origin Louis Sæmann. He was born in Görlitz, Saxony, on November 11, 1821. He began as a fossil collector and worked for Adam August Krantz (1808-1872) in Berlin before opening his own competing shop in Paris in 1850. He was apparently well versed in the science of mineralogy, and wroter of various paleontological studies as well. He died in Paris, France on September 13, 1866, and his mineral business was then purchased by his old mentor, Adam Krantz in Bonn.
Several important Saemann specimens are preserved today in the School of Mines, Paris, including so-called type specimens of the now-discredited species latrobite (supplied by Sæmann in 1863), and waltherite (supplied by Sæmann in 1865), as well as a specimen of adamite which Sæmann had obtained from Gilbert-Joseph Adam himself. The Australian Museum in Sydney acquired 536 mineral specimens from Sæmann in 1861. The earliest dated label in the Mineralogical Record Archive is from 1857. He also dealt in rock samples, and had fully pre-printed labels for many of his minerals and rocks. Many of his detailed, mostly pre-printed labels listed species synonyms according to the authorities of the day, and even included a category for accessory minerals.