Articles | Volume 36, issue 4
https://doi.org/10.5194/ejm-36-605-2024
https://doi.org/10.5194/ejm-36-605-2024
Research article
 | 
19 Aug 2024
Research article |  | 19 Aug 2024

Rotherkopfite, KNa2(Fe2+2.5Ti4+1.5)Fe2+(Si4O12)2, a new neptunite-group mineral without essential lithium, from Rother Kopf, Eifel volcanic fields, Germany

Anthony R. Kampf, Gerhard Möhn, Chi Ma, George R. Rossman, Joy Désor, and Yunbin Guan

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Cited articles

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Chukanov, N. V., Rastsvetaeva, R. K., Aksenov, D. M., Blass, G., Pekov, I. V., Belakovskiy, D. I., Tschörtner, J., Schüller, W., and Ternes, B.: Emmerichite, Ba2Na(Na,Fe2+)2(Fe3+,Mg)Ti2(Si2O7)2O2F2, a new lamprophyllite-group mineral from the Eifel volcanic region, Germany, New Data Min., 49, 5–13, 2014. 
Gagné, O. C. and Hawthorne, F. C.: Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen, Acta Crystallogr. B, 71, 562–578, 2015. 
Gunter, M. E., Bandli, B. R., Bloss, F. D., Evans, S. H., Su, S. C., and Weaver, R.: Results from a McCrone spindle stage short course, a new version of EXCALIBR, and how to build a spindle stage, Microscope, 52, 23–39, 2004. 
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Short summary
Rotherkopfite is the first member of the neptunite group that does not contain lithium in its chemical formula. It was found at Rother Kopf, Eifel volcanic fields, Germany, where in occurs in cavities in a quartz–sanidine fragment embedded in a volcanic rock. Rotherkopfite occurs as dark brownish-red crystals, up to about 0.2 mm across. The intriguing crystal structure is based on two interwoven three-dimensional frameworks.
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