University of Hamburg Mineralogical Museum of the University of Hamburg
Mineral name
 
Karlite
Karlite holotype material
Hölzel-No.
 
6.AB.270
Type of specimen
 
HT
IMA-No. / Accepted
 
1980-030
Chemical formula
 
Mg6Al0.5[(OH)4|(BO3)3]+ 0.5Cl
Type locality
 
Austria, Zillertal, Schlegeisstausee, Furtschaglkar
Associated minerals
 
Next to ludwigite in a clinohumite-chlorite marble
Collection
 
Mineralogische Sammlungen - Technische Universität Berlin
Contact person
 
Dr. Robert Johannes Giebel
Catalogue−No. / Site
 
85/72 / 18-6
Nature of 
type specimen

 
Sample with needle-like crystals up to 10 mm in size, intergrown with ludwigite in a clinohumite-chlorite marble
References

Karlite, Mg7(BO3)3(OH,Cl)5, a new borate mineral and associated ludwigite from the Eastern Alps.
Franz, G., Ackermand, D. and Koch, E. (1986)
Amer. Miner., 66, 872-877.

Karlite: crystal structure and chemical composition.
Bonazzi, P., Menchetti, S., Sabelli, C. und Trosti-Ferroni, R. (1986)
N. Jb. Miner. Mh., 253-262
Notes / Further information

Collected by Prof. Dr. G. Franz; named in honor of Prof. Dr. Franz Karl, mineralogist and petrologist at the University of Kiel, Germany.
Last update 27. April 2022 by A. Matthies Imprint (german)