Not only the Harbours near Rotterdam are built with bolders and stones from abroad. Also the dikes upstream of the Maas and Ijssel are based on material from mostly Germany and Belgium. When examining carefully, sometimes nice finds are possible. The pictures shown are finds from the area of Hollandse Ijssel, Lek (Zaag) and Noord. A few (like the first one) originate from Slag, others from Porfier. Two are biological Induced mineralization (BIM).
Andradite FoV 2,5 mm Krimpen
Åkermanite – Gehlenite (Raman/EDX) FoV 5mm (Slag) FoV 2mm
Åkermanite – Gehlenite (Raman/EDX) FoV 2,5 mm (Slag) FoV 2,5mm (Krimpen)
Galena, Lek Calcite Marcasite Jaarsveld Calcite, Jaarsveld Marcasite Calcite Jaarsveld

Salammoniac FoV 2,5mm Åkermanite – Gehlenite (Raman/EDX) FoV 2,5 mm (Slag) Åkermanite – Gehlenite (Raman/EDX) FoV 2,5 mm (Slag)
Åkermanite – Gehlenite (Raman/EDX) (Slag) Åkermanite – Gehlenite (Raman/EDX) (Slag) Salammoniac FoV 4mm Aragonite (Raman) FoV 2,5mm (Slag) Åkermanite – Gehlenite (Raman/EDX)
Åkermanite – Gehlenite (Raman/EDX) FoV 5mm (Slag)
Gypsum (Raman) FoV 2,5mm Thaumasite (Raman) FoV 2,5mm (Slag)
Åkermanite – Gehlenite (Raman/EDX) Åkermanite – Gehlenite (Raman/EDX) FoV 4mm (Slag)
Aragonite FoV 5mm FoV 5mm
FoV 5mm FoV 5mm
Weddellite/whewellite, FoV 4mm (!) Weddellite/whewellite, FoV 4mm (!)
Manganite FoV 4mm
Aragonite (Slag) Thaumasite (Slag) (Slag) (Slag) (Slag) Thaumasite (Slag) (Slag) (Slag) Åkermanite – Gehlenite (Raman/EDX) (Slag) (Slag)
Calcite FoV 4mm Thaumasite FoV 2mm Calcite FoV 2mm Calcite FoV 2mm Thaumasite FoV 4mm
FoV 2mm Åkermanite – Gehlenite (Raman/EDX) (Slag)
FoV 4mm
Calcite on dendric perovskite FoV 2mm
Fov 2mm Calcite on dendric perovskite Cuprite FoV 1mm
TRidymite Cuprite Copper FoV 1,3mm FoV 4mm
FoV 2mm
Andradite FoV 3.3 mm Krimpen Andradite FoV 3.3 mm Krimpen
FoV 4mm FoV 2mm
Biotite, Nephelline FoV 4,5mm Gouderak Apatite, Nephelline FoV 4,5mm Gouderak Biotite, Nephelline FoV 4,5mm Gouderak Nephelline FoV 4,5mm Gouderak Apatite, Nephelline FoV 4,5mm Gouderak Slag FoV 4,5mm Gouderak FoV 2,2mm FoV 2mm Aragonite FoV 2 cm Gouderak
FoV ca 1,7mm Hematite FoV 2,2mm
FoV 2,2mm FoV 4,5mm FoV 4,5mm FoV 3,3mm
Gypsum FoV 4,5mm
Nice
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