Kunkskopf quarry, Wassenach, Brohltal, Ahrweiler, Rhineland-Palatinate, Germany

Black botryoidal Birnessite (not analysed) on unidentified matrix Locality on label: Kunkskopf, Eifel, Rheinland Pfalz, B.R.D. The label possibly dates to the period from 1949 to 1990, during which time Germany was split into the "Bundesrepublik Deutschland" ("West Germany") and the Deutsche Demokratische Republik ("East ...

Birnessite belongs to the manganomelane group and it generally forms as a weathering or secondary transformation product. From the volcanic Eifel, birnessite has so far only been described from the Kunkskopf near Wassenach (quoted G. Blaß). On the Kunkskopf it forms soft, cauliflower-like to dendritic aggregates of dull gray to dull black in ...

This is a micromount specimen of pseudobrookite and amphibole from Kunkskopf, Wassenach, Brohltal, Ahrweiler, Eifel Volcanic Field, Rhineland-Palatinate, Germany. I acquired this specimen from Don Smoley at the 2019 Mansfield mineral show. Jamison K. Brizendine specimen and photo.

© Jamison K. Brizendine

Birnessite belongs to the manganomelane group and it generally forms as a weathering or secondary transformation product. From the volcanic Eifel, birnessite has so far only been described from the Kunkskopf near Wassenach (quoted G.Blaß). On the Kunkskopf it forms soft, cauliflower-like to dendritic aggregates of dull gray to dull black in ...

Birnessite belongs to the manganomelane group and it generally forms as a weathering or secondary transformation product. From the volcanic Eifel, birnessite has so far only been described from the Kunkskopf near Wassenach (quoted G.Blaß). On the Kunkskopf it forms soft, cauliflower-like to dendritic aggregates of dull gray to dull black in ...