Zanazziite is a complex hydrated phosphate mineral from the roscherite group.

[5] It is found in the crevices of Lavra da Ilha pegmatite, near Taquaral, in northeastern Minas Gerais, Brazil.

[5] Zanazziite was recently analyzed with an ARL-SEMQ microprobe; the values were Durango apatite for P, Rockport fayalite for Mn, and Kakanui hornblende for all others.

The spectroscopic analysis and other microprobes revealed P2O5, 39.27, SiO2 0.36, Al2O3 1.54, Fe2O3 0.76, CaO 10.65, MgO 11.66, FeO 9.63, MnO 1.77, BeO 9.81, H2O 13.32, total of 98.77.

The roscherite-group nomenclature is based on the dominant cation in the Me-site; valid species include: Roscherite (

X-ray diffraction showed the strongest lines in Å, with intensities and indices: 9.50 (90) (110), 5.91 (100) (020), 3.16 (70) (330), 3.05 (50) (510), 2.766 (50) (240), 2.682 (40b) (600), 2.208 (40), 1.642 (50b).

[6] The crystal structure and monoclinic symmetry of the cell data edge lengths: a=15.876A, b=11.860A, c=6.607A, and angle: beta=95.49 degrees.

The roscherite analog zanazziite was found in Lavar da Ilha deposits in Minas Gerais, Brazil.

[5] The pegmatite consists of a wall zone rich in feldspar and muscovite, and a quartz core.

[5] This is special to quartz and phosphate due to the rich locality of Minas Gerais.

Minas Gerais contains the world's most diverse concentration of complex granitic pegmatites.

This region is responsible for the production of gem beryl, chrysoberyl, topaz, tourmaline, and kunzite.