In print

Bertrix: Roter Anatas aus den Belgischen Ardennen. Harjo Neutkens, 2005. Lapis 2005 nr 10

Smaragd 2004, Anatas 2005: “Kristallfestival” im Habachtal. Harjo Neutkens, 2006. Lapis 2006 nr 6

Neu und schön: Calcit und Fluorit aus Belgien. Harjo Neutkens and Mario Orinx, 2007. Lapis 2007 nr2

Neufunde: Interessante Nickelmineralien aus der Donnerkuhle im Sauerland. Harjo Neutkens and Robin Bakker, 2008. Lapis 2008 nr 2

Quarz aus Belgien – die aktuelle Funden von 2010 bis 2012. Harjo Neutkens, 2013. Mineralien Welt 2013 nr 3

Calcite from Belgium – A short overview and an interesting new find. Harjo Neutkens, 2014. The Mineralogical Record 2014 nr 2

Sand calcite from Fontainebleau, France. Harjo Neutkens, Ingo Löffler and Wendell Wilson, 2014. The Mineralogical Record 2014 nr 4

Faden quartz from Bierghes, Brabant, Belgium. Harjo Neutkens, Stijn Claeys and Tom Costes, 2019. The Mineralogical Record 2019 nr 4

On the web

Millerite: https://www.mindat.org/a/best_millerite

Emerald: https://www.mindat.org/a/best_beryl_var_emerald

Epidote: https://www.mindat.org/a/best_epidote

Schalenblende: https://www.mindat.org/a/best_schalenblende

Turquoise: https://www.mindat.org/a/best_turquoise

Anatase: https://www.mindat.org/a/best_anatase

Topaz: https://www.mindat.org/a/best_topaz

Beryl: https://www.mindat.org/a/best_beryl

Beryl var. Goshenite: https://www.mindat.org/a/best_beryl_var_goshenite

Beryl var. Heliodor: https://www.mindat.org/a/best_beryl_var_heliodor

Beryl var. Morganite: https://www.mindat.org/a/best_beryl_var_morganite

Beryl var. Aquamarine: https://www.mindat.org/a/best_beryl_var_aquamarine

Baryte, Belgium: https://www.mindat.org/a/best_baryte_belgium

Calcite, Belgium: https://www.mindat.org/a/best_calcite_belgium

Ferristrunzite: https://www.mindat.org/a/best_ferristrunzite

Fluorite, Belgium: https://www.mindat.org/a/best_fluorite_belgium

Quartz, Belgium: https://www.mindat.org/a/best_quartz_belgium

Quartz, Austria: https://www.mindat.org/a/best_quartz_austria

Vantasselite: https://www.mindat.org/a/best_vantasselite

Xenotime-(Y): https://www.mindat.org/a/best_xenotimey

Thoughts on conservationism and collecting: http://www.mindat.org/blog.php/834/Conservationism+and+collecting%2C+some+thoughts….

Basic mineral micro photography tutorial: http://www.mindat.org/article.php/340/Basic+mineral+microphotography

Collecting in Habach Valley, Austria: http://www.mindat.org/article.php/564/Habach+valley+collecting