Optical Spectra of Heterosite, (Fe,Mn)PO₄

• Langer K. Taran MN, Fransolet AM (2007) Electronic absorption spectra of phosphate minerals with olivine-type Structures: II. The oxidized minerals ferrisicklerite, ^M1[6](□_{1− x} Li _x )^M2[6](Fe³⁺_{1− x} Mn²⁺ _x )[PO₄], and heterosite,^M1[6](□_1.00)^M2[6](Fe³⁺_1−xMn³⁺_x)[PO₄], with x ≤ 0.5. European Journal of Mineralogy 19, :589-592.