GreenSpar is a form of the mineral Anorthosite (aluminosilicate), a rare compositional variety of plagioclase feldspar. It is unique in that it is very dense and has a high refractive index. It can be used as a premium mineral extender for interior paints requiring very good abrasion resistance and can also result in a stronger finish and cost savings as a resin filler in clear coatings.
Regarding thermoplastic end uses, GreenSpar offers high hardness, closed angular structure for low binder demand, and low Refractive Index.
In addition to GreenSpar, the Hudson deposit at White Mountain in Greenland can be exploited to yield high-purity alumina and Anocrete, a CO2-free heat resistant form of concrete. The company was recently asked by space agencies to provide samples of its anorthosite for the purpose of simulating the lunar landscape, which has a geology similar to the one being mined by Hudson. The uniqueness of this mineral deposit has also resulted in a recent visit to the mine by the US State Department as part of its assessment of strategic minerals, including the company’s Sarfartoq rare earth project.
Hudson, through Hudson Greenland A/S, owns 100% of the White Mountain Anorthosite mine in Greenland. The calcium feldspar mine is in operation and permitted for 50 years.