Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Nepheline basanite from
Siebengebirge, Cologne, North Rhine-Westphalia, Germany


Locality type:Range of Mountains and Hills
Classification
Type:Nepheline basanite
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Nepheline basanite data
Locality Data:Click here to view Siebengebirge, Cologne, North Rhine-Westphalia, Germany
Data Identifiers
Mindat Occurrence Record ID:1382091
Long-form Identifier:1:3:1382091:8
GUID (UUID V4):0
References
Vieten, K. 1980. The minerals of the volcanic rock association of the Siebengebirge. 1. Clinopyroxenes. 2. Variation of chemical composition of Ca-rich clinopyroxenes (salites) in the course of crystallization. Neues Jahrbuch für Mineralogie Abhandlungen, 140, 54-88.
Todt, W., & Lippolt, H. J. (1980). K-Ar age determinations on tertiary volcanic rocks: 5. Siebengebirge, Siebengebirge-Graben. Journal of Geophysics| IF 32.18, 48(1), 18-27.
Stindl, H., & Vieten, K. (1982). The minerals of the volcanic rock association of the Siebengebirge. II. Olivines 1. Idiocrysts and xenocrysts. Neues Jahrbuch für Mineralogie. Abhandlungen, 145(2), 183-199.
Vieten, K. (1983). Tertiary volcanism in the Siebengebirge mountains. In Plateau Uplift (pp. 131-132). Springer, Berlin, Heidelberg.
Moreva-Perekalina, T. V., & Moreva-Perekalina, T. V. (1985). Ultramafic xenoliths from alkaline basalts of Finkenberg (Siebengebirge, West Germany) (Vol. 78). Rijksmuseum van Geologie en Mineralogie. pp. 1-50.
Vieten, K., Hamm, H. M., & Grimeisen, W. (1988). Tertiärer Vulkanismus des Siebengebirges. Fortschritte Mineralogie 66. Beiheft, 2, 1-42.
Le Maitre, R. W. - Ed. (1989) A Classification of Igneous Rocks and Glossary of Terms - Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks (1st ed.). Blackwell Scientific Publications.
Le Maitre, R. W. - Ed. (2002) Igneous Rocks - A Classification and Glossary of Terms (2nd ed.) Cambridge University Press. doi:10.1017/cbo9780511535581
Jung, S., Vieten, K., Romer, R. L., Mezger, K., Hoernes, S., & Satir, M. (2012). Petrogenesis of Tertiary alkaline magmas in the Siebengebirge, Germany. Journal of Petrology, 53(11), 2381-2409.
Kolb, M., Paulick, H., Kirchenbaur, M., & Münker, C. (2012). Petrogenesis of mafic to felsic lavas from the Oligocene Siebengebirge Volcanic Field (Germany): implications for the origin of intracontinental volcanism in Central Europe. Journal of Petrology, 53(11), 2349-2379.
 
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