An aggregate of fibrous, greenish-silvery anthophyllite.

An interesting historic specimen which comes with antique label of Hugo Francke. The name 'Niguhaetit' is not even listed in the 'Glossary of obsolete mineral names', and also the 'Glen Niguhach' seems to be non-existing.

Comes with antique H. Francke label. Hermann Hugo Alfred Francke was born in Plauen near Dresden on March 31, 1860. In 1882 he enrolled at the University of Jena to study Natural History. There he concentrated on the subject of mineralogy, which had fascinated him since his early school years. The following year he was hired as an Assistant to the Mineralogical Institute at Jena. Unfortunately his montor there, Geh. Hofrats Prof. Dr. E. E. Schmid, died in 1885, rendering Francke an academic "orphan," unable to complete his mineralogical studies there for lack of any other mineralogist on the faculty. Consequently Francke left Jena to enroll at the University of Leipzig, where he completed his PhD program, devoting most of his work time during his eight terms in Leipzig to a study of the history of mineralogy and mineralogical litertature, along with some linguistic studies. In 1890 Francke published "Über die mineralogische Nomenklatur", a now very scarce and overlooked but important and thorough study of mineralogical names, what they encompass, their history, species and variety names, characteristics of such names, rules governing their choice, etc. This work is an extension of the his doctoral dissertation "Die allgemeinen Grundsätze bei der Bildung wissenschaftlicher Mineralnamen" that was presented at the University of Leipzig in 1889. (cit minrec)