The Hendrik is a former Dutch coal mine. On its dumps one may find Gypsum, Chalcopyrite, Pyrite, Calcite, Dolomite, Aragonite and Sphalerite. A few others like Millerite are more rare. I visited the dumps several times and managed to make quite a few finds. A find I did in 2019 with Fluorite is extremely rare, counts as a first find in the Netherlands and not documented via a picture before. Also the Mica that I found in 2020 is pretty special. And I have only one Siegenite. The location is becoming smaller over time as the dump is re-used. But the digging provides new opportunities.