[4] The quarry itself is located in a complex rare-element granitic pegmatite that has produced large quantities of gem tourmaline as well as many other rare phosphate species.

Zigrasite exhibits imperfect cleavage in two directions, parallel to (010) and (001), it shows no parting, is brittle and has hackly fracture.

In transmitted light zigrasite is colorless and non-pleochroic, biaxial negative with indices of refraction α 1.597(1) β 1.622 (1), γ 1.635 (1).

There are also two magnesium, both of which are occupied solely by Mg and are octahedrally coordinated by two oxygen anions and four (H2O) groups with distances of 2.064 and 2.075 Å.

Zigrasite can be considered to be the magnesium end member for the zircon phosphate grains found in the giant 1972 pocket.

[3] The powder-diffraction pattern was recorded with Cu-Ka X-radiation on a DebyeScherrer camera with a diameter of114.6 mm and a Gandolfi attachment.