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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Maasei

A variety of 'Flint'
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01955770017490354125011.jpg
Flint, etc.

Gütersloh, Detmold, North Rhine-Westphalia, Germany
08187480017403430292423.jpg
Flint, etc.

Gütersloh, Detmold, North Rhine-Westphalia, Germany
01955770017490354125011.jpg
Flint, etc.

Gütersloh, Detmold, North Rhine-Westphalia, Germany
08187480017403430292423.jpg
Flint, etc.

Gütersloh, Detmold, North Rhine-Westphalia, Germany
07099310017403518691323.jpg
Flint, etc.

Gütersloh, Detmold, North Rhine-Westphalia, Germany
08187480017403430292423.jpg
Flint, etc.

Gütersloh, Detmold, North Rhine-Westphalia, Germany
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About MaaseiHide

Local name for rounded (due to wave action) flint found in the Niederrhein area in Germany.
Literally 'Maas egg'.


Unique IdentifiersHide

Mindat ID:
55347 (as Maasei)
6676 (as Flint)
Long-form identifier:
mindat:1:1:55347:4 (as Maasei)
mindat:1:1:6676:7 (as Flint)

Common AssociatesHide

Associations Based on Photo Data:
2 photos of Maasei associated with 'Flint'

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for MaaseiHide

References for MaaseiHide

Quick NavTopAbout MaaseiUnique IdentifiersCommon AssociatesOther InformationInternet Links References
 
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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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