The new minerals natromarkeyite, Na2Ca8(UO2)4(CO3)13(H2O)24⋅3H2O (IMA2018-152) and pseudomarkeyite, Ca8(UO2)4(CO3)12(H2O)18⋅3H2O (IMA2018-114) were found in the Markey mine, San Juan County, Utah, USA, where they occur as secondary phases on asphaltum. Natromarkeyite properties are: untwinned blades and tablets to 0.2 mm, pale yellow green colour; transparent; white streak; bright bluish white fluorescence (405 nm laser); vitreous to pearly lustre; brittle; Mohs hardness 1½ to 2; irregular fracture; three cleavages ({001} perfect, {100} and {010} good); density = 2.70(2) g cm–3; biaxial (–) with α = 1.528(2), β = 1.532(2) and γ = 1.533(2); and pleochroism is X = pale green yellow, Y ≈ Z = light green yellow. Pseudomarkeyite properties are: twinned tapering blades and tablets to 1 mm; pale green yellow colour; transparent; white streak; bright bluish white fluorescence (405 nm laser); vitreous to pearly lustre; brittle; Mohs hardness ≈ 1; stepped fracture; three cleavages ({10 $\bar{1}$ } very easy, {010} good, {100} fair); density = 2.88(2) g cm–3; biaxial (–) with α = 1.549(2), β = 1.553(2) and γ = 1.557(2); and it is nonpleochroic. The Raman spectra of markeyite, natromarkeyite and pseudomarkeyite are very similar and exhibit bands consistent with UO22+, CO32– and O–H. Electron microprobe analyses provided the empirical formula Na2.01Ca7.97Mg0.03Cu2+0.05(UO2)4(CO3)13(H2O)24⋅3H2O (–0.11 H) for natromarkeyite and Ca7.95(UO2)4(CO3)12(H2O)18⋅3H2O (+0.10 H) for pseudomarkeyite. Natromarkeyite is orthorhombic, Pmmn, a = 17.8820(13), b = 18.3030(4), c = 10.2249(3) Å, V = 3336.6(3) Å3 and Z = 2. Pseudomarkeyite is monoclinic, P21/m, a = 17.531(3), b = 18.555(3), c = 9.130(3) Å, β = 103.95(3)°, V = 2882.3(13) Å3 and Z = 2. The structures of natromarkeyite (R1 = 0.0202 for 2898 I > 2σI) and pseudomarkeyite (R1 = 0.0787 for 2106 I > 2σI) contain uranyl tricarbonate clusters that are linked by (Ca/Na)–O polyhedra forming thick corrugated heteropolyhedral layers. Natromarkeyite is isostructural with markeyite; pseudomarkeyite has a very similar structure.

新的矿物natromarkeyite，钠2的Ca 8（UO 2）4（CO 3）13（H 2 O）24 ⋅3H 2 O（IMA2018-152）和pseudomarkeyite，钙8（UO 2）4（CO 3）12（ ħ 2 O）18 ⋅3H 2O（IMA2018-114）在美国犹他州圣胡安县的Markey矿中发现，在沥青质中作为次生相存在。鹦鹉螺石的特性是：未缠绕的刀片和片剂至0.2毫米，浅黄绿色；透明; 白色条纹 明亮的蓝白色荧光（405 nm激光）；玻璃状至珍珠光泽；脆; 莫氏硬度1½至2；不规则骨折 三裂（{001}完美，{100}和{010}良好）；密度= 2.70（2）g cm –3；双轴（–），其中α= 1.528（2），β= 1.532（2）和γ= 1.533（2）；和多色性是X =淡绿色黄色，ÿ ≈ ž=浅绿色黄色。假马基石的特性是：锥形刀片和片剂的孪晶锥形至1毫米；浅绿色的黄色；透明; 白色条纹 明亮的蓝白色荧光（405 nm激光）；玻璃状至珍珠光泽；脆; 莫氏硬度≈1; 阶梯状骨折 三个分裂（{10 $ \ bar {1} $ }非常容易，{010}好，{100}公平）；密度= 2.88（2）g cm –3；双轴（–），其中α= 1.549（2），β= 1.553（2）和γ= 1.557（2）；这是非疏油性的。马氏体，钠马氏体和假马氏体的拉曼光谱非常相似，其谱带与UO 2 2 +，CO 3 2–和O–H一致。电子探针分析提供了经验公式Na 2.01 Ca 7.97 镁0.03的Cu 2+ 0.05（UO 2）4（CO 3）13（H 2 O）24 ⋅3H 2 O（-0.11 1H）用于natromarkeyite和Ca 7.95（UO 2）4（CO 3）12（H 2 ö ）18 ⋅3H 2 O（0.10 1H）用于pseudomarkeyite。Natromarkeyite为斜方晶，PMMN，一个= 17.8820（13），b = 18.3030（4），C ^ = 10.2249（3）A，V = 3336.6（3）3和Z =2。假马氏体是单斜晶的，P 2 1 / m，a = 17.531（3），b = 18.555（3），c = 9.130（3），β= 103.95（3）°，V = 2882.3（13） ）埃3和ž = 2 natromarkeyite的结构（- [R 1 = 0.0202为2898我>2σ我）和pseudomarkeyite（[R 1 = 0.0787为2106我>2σ我）包含由（Ca / Na）–O多面体连接的三碳酸铀酰簇，形成厚的波纹状杂多面体层。钠马格石与马格石同构。假马来石具有非常相似的结构。