Abstract Monteneroite (IMA2020-028), Cu2+Mn2+2(AsO4)2⋅8H2O, is a new vivianite-structure mineral from the Monte Nero mine, Rocchetta di Vara, La Spezia, Liguria, Italy. It is a secondary mineral that crystallised from As-, Cu- and Mn-rich fluids and it is associated with braunite, copper, cuprite, rhodochrosite and strashimirite. Monteneroite occurs as light green, thick blades up to ~2.5 mm long. The streak is white. Crystals are transparent with vitreous lustre. The mineral has Mohs hardness of 2, is somewhat sectile, exhibits two cleavages ({010} perfect and {001} fair) and has irregular stepped fracture. The measured density is 2.97(2) g cm–3. Monteneroite is optically biaxial (+), with α = 1.604(2), β = 1.637(2) and γ = 1.688(2), determined in white light; 2V = 80(1)°; slight dispersion is r < v, orientation: X = b; Z ^ c = 52° in obtuse β. Electron microprobe analyses provided the empirical formula (Cu2+0.88Mn2+0.11)Σ0.99Mn2+2.00(As1.00O4)2⋅8H2O. Monteneroite is monoclinic, C2/m, a = 10.3673(14), b = 13.713(2), c = 4.8420(8) Å, β = 105.992(8)°, V = 661.72(18) Å3 and Z = 2. Monteneroite has a vivianite-type structure (R1 = 0.0535 for 534 I > 2σI reflections). It is the first mineral with this structure type to be defined with ordered octahedral cation sites.

中文翻译：

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Monteneroite，Cu2+Mn2+2(AsO4)2⋅8H2O，一种新的具有有序阳离子的紫云母结构矿物，来自意大利利古里亚的 Monte Nero 矿

摘要 Monteneroite (IMA2020-028)，Cu2+Mn2+2(AsO4)2⋅8H2O，是一种来自意大利利古里亚拉斯佩齐亚Rocchetta di Vara Monte Nero矿的一种新的紫云母结构矿物。它是一种从富含 As、Cu 和 Mn 的流体中结晶出来的次生矿物，与布劳恩石、铜、赤铜矿、菱锰矿和菱锰矿有关。Monteneroite 以浅绿色、厚叶片的形式出现，长达约 2.5 毫米。条纹是白色的。水晶是透明的，有玻璃光泽。该矿物的莫氏硬度为 2，具有一定程度的分切性，显示出两个解理（{010} 完美和{001} 中等）并且具有不规则的阶梯状断裂。测得的密度为 2.97(2) g cm–3。黑山是光学双轴 (+)，α = 1.604(2)，β = 1.637(2) 和 γ = 1.688(2)，在白光下测定；2V = 80(1)°；轻微色散为 r < v，取向：X = b；Z ^ c = 52° 钝角 β。电子探针分析提供了经验公式 (Cu2+0.88Mn2+0.11)Σ0.99Mn2+2.00(As1.00O4)2⋅8H2O。黑山为单斜晶系，C2/m，a = 10.3673(14)，b = 13.713(2)，c = 4.8420(8) Å，β = 105.992(8)°，V = 661.72(18) Å3，Z = 2。 Monteneroite 具有紫铁矿型结构（对于 534 I > 2σI 反射，R1 = 0.0535）。它是第一种用有序八面体阳离子位点定义的具有这种结构类型的矿物。