In 2017, a Dutch well known strahler discovered a spot with slag material from a former smelter (Hutte) in the Netherlands. The smelter was processing material from the area of Kelmis (B) and at its end-stage probably also processed material from Congo. I happend to be informed at an early stage and collected quite a few nice specimen of secondary ‘phases’. Since the minerals are developed on slag (left over of the smelter), they officially do not have the status of mineral although in nature they may occur as well. Another well known strahler from Köln assisted in identifying a few of them using EDX and Raman. But quite a few are still unidentified. Most of the fields of view are less than half a cm down to just 2-3 mm. The pictures of (Limonite after) Fougerite are exra interesting as the material is put on photo just after cracking (still black) and 24 hours later (orange). Who said the Netherlands are not interesting for mineral hunters?
Hydromagnesite/Dypingite and traces of Calcite (Raman)
Gypsum 
Melilith (blue), Monticellite (Raman) 
Zinkite 
Hydromagnesite/Dypingite and traces of Calcite (Raman) 
Hydromagnesite/Dypingite and traces of Calcite FoV 3mm 
Zinkite
Melilith 
Limonite after Fougerite 
Limonite after Fougerite
Fougerite
Fougerite
Melilith 
Hydrozincite/hydromagnesite? 
Zinkite
Fougerite 
Limonite after Fougerite 
Zincite FoV 3mm 
Namuwit group FoV 3mm 
Namuwit group (Raman)
Devilline group? FoV 5mm
Devilline group? FoV 5mm
Devilline group? FoV 5mm
Hydrozincite/hydromagnesite? (FoV 4mm) 
Thaumasite-Hielscherite (FoV 4mm) 
Gypsum, Limonite after Fougerite (FoV 4mm) 
Gypsum, Limonite after Fougerite (Fov 3,5mm) 
Melilith ? Spessartin? FoV 2,3mm
Boussingaulite FoV 3,8mm
Boussingaulite FoV 5mm (Raman) 
Boussingaulite FoV 5mm (Raman) 
Boussingaulite FoV 5mm (Raman) 
FoV 4,5 mm
Thaumasite-Hielscherite 
Fougerite
Hydrozincite? FoV 3mm
FoV 4mm 
Melilith FoV 4mm 
FoV 4mm 
Jamborite FoV 4mm (Raman, EDX)
Melilith Monticellite FoV 3mm 
Thaumasite-Hielscherite FoV 2,5mm (Raman0
FoV 2,5mm
Melilith Monticellite
Boussingaultite (?) FoV 3,8mm
FoV 1,8mm
Sphalerite {111}
