A new member of the epidote supergroup, ferriandrosite-(Ce), ideally MnCeFe3+AlMn2+(Si2O7)(SiO4)O(OH), was found at the Július manganese ore occurrence near Betliar, Rožňava Co., Košice Region, Slovakia. It occurs as subhedral grains and polycrystalline aggregates, up to 0.3 mm in size, enclosed in pyroxmangite. Other associated minerals are spessartine, rhodochrosite, quartz, baryte and pyrosmalite-(Mn). Ferriandrosite-(Ce) is dark brown, with a light brown streak and vitreous lustre. The Mohs hardness is ~6½ to 7 and tenacity is brittle with no observable cleavage or fracture. The calculated density is 4.321 g⋅cm–3. Ferriandrosite-(Ce) is optically biaxial (+), with weak pleochroism, high surface relief and the mean calculated refractive index is 1.832. The empirical structural formula of ferriandrosite-(Ce), based on 13 anions per formula unit, is A1(Mn2+0.63Ca0.35Ce0.02)Σ1.00A2(Ce0.53La0.27Nd0.14Pr0.05REE*0.01)Σ1.00M1(Fe3+0.41Al0.12V3+0.01Mg0.40Ti0.05)Σ0.99M2Al1.00M3(Mn2+0.75Fe2+0.22Mg0.03)Σ1.00T1–3Si3.00O11O4(O0.67F0.33)(OH), where REE* are minor rare earth elements. Ferriandrosite-(Ce) is monoclinic, space group P21/m, a = 8.8483(4) Å, b = 5.7307(3) Å c = 10.0314(5) Å, β = 113.3659(15)°, V = 466.95(4) Å3 and Z = 2. The crystal structure of ferriandrosite-(Ce) was refined to a final R1 = 0.0210 for 1910 reflections with Fo > 4σ(Fo) and 127 refined parameters. Structural features of ferriandrosite-(Ce) are discussed and compared with other members of the androsite-series.

绿帘石超群的新成员铁铁锰矿-(Ce)，理想情况下是 MnCeFe 3+ AlMn 2+ (Si 2 O 7 )(SiO 4 )O(OH)，在 Rožňava Co 的 Betliar 附近的 Július 锰矿矿区被发现。 ，斯洛伐克科希策地区。它以亚面体晶粒和多晶聚集体的形式出现，尺寸达 0.3 毫米，包裹在辉锰矿中。其他伴生矿物有锰铝矿、菱锰矿、石英、重晶石和焦锰矿。铁铁锰矿-(Ce)呈深棕色，带有浅棕色条纹，具有玻璃光泽。莫氏硬度约为 6.5 至 7，韧性脆，没有可观察到的解理或断裂。计算出的密度为 4.321 g⋅cm –3。铁铁锰矿-(Ce)具有双轴性(+)，具有弱多色性、高表面浮雕，平均计算折射率为1.832。铁铁锰矿-(Ce)的经验结构式基于每个化学式单元13个阴离子，为A 1 (Mn 2+ 0.63 Ca 0.35 Ce 0.02 ) Σ1.00 A 2 (Ce 0.53 La 0.27 Nd 0.14 Pr 0.05 REE* 0.01 ) Σ1.00 M 1 (Fe 3+ 0.41 Al 0.12 V 3+ 0.01 Mg 0.40 Ti 0.05 ) Σ0.99 M 2​​ Al 1.00 M 3 (Mn 2+ 0.75 Fe 2+ 0.22 Mg 0.03 ) Σ1.00 T 1–3 Si 3.00 O 11 O4 (O 0.67 F 0.33 )(OH)，其中 REE* 是微量稀土元素。铁铁锰矿-(Ce)是单斜晶系，空间群P 2 1 / m , a = 8.8483(4) Å, b = 5.7307(3) Å c = 10.0314(5) Å, β = 113.3659(15)°, V = 466.95 (4) Å 3和Z = 2。对于 1910 次反射，F o > 4σ( F o ) 和 127 个细化参数，铁铁锰矿-(Ce) 的晶体结构被细化为最终R 1 = 0.0210。讨论了铁铁锰矿-(Ce) 的结构特征，并与铁锰矿系列的其他成员进行了比较。