After trying and researching several chalks we have come across what we believe to be one of the smoothest powdered chalks money can buy. This Magnesium Carbonate is from the Dolmitic origin and sourced from Barcelona (Spain). The bottom line is it is as smooth as can be.
Magnesium Carbonate Dolmatic origin (4Mg Co3 Mg(OH)2 SH2O)
Allergen free in accordance with Directives 2001/13/EC 2003/89/EC 2005/26/EC 2005/63/EC 2006/142/EC