Dokl. Akad. Nauk SSSR, 1977 Volume 236, Number 5,Pages 1123–1126(Mi dan41292)
CRYSTALLOGRAPHY
Crystalline structure of
$\mathrm{Na}_2(\mathrm{Fe}_{0,5}^{3+}\mathrm{Fe}_{0,5}^{2+})_2\mathrm{Fe}^{2+}[\mathrm{PO}_4]_3$ –
a synthetic variety of alluaudite