[4] In 1992 Karup-Moller and Petersen, together with von Knorring and Leonardsen, found more specimens from a second find in the Aris Quarry in Namibia, that allowed a better definition of the properties and composition of the mineral.

[8] Later still, in 2005, more material was found by a group of researchers from the University of São Paulo at the Bortolan Quarry, Pocos de Caldas, Brazil, and although the crystals were small, accurate determinations were made of their physical and optical properties, which differed slightly from those of the specimens from Greenland and Namibia.

[4] The mineral belongs to the monoclinic crystal class 2/m, meaning that it has a twofold axis of rotational symmetry perpendicular to a mirror plane.

[10] The spacing between the layers, in the c direction, is about 5 Å, which is typical for minerals with an amphibole-type structure, due to the repeat distance along the chains of tetrahedra.

For the three main localities the reported values are: Tuperssuatsiaite occurs as fan-shaped aggregates up to several centimeters across, as rosettes and as fibers elongated parallel to the c axis.