The new mineral yurgensonite, ideally K2SnTiO2(AsO4)2, the first natural arsenate with species-defining tin, and the continuous isomorphous series between yurgensonite and katiarsite KTiO(AsO4) are described from sublimates of the Arsenatnaya fumarole at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. Yurgensonite and a Sn-bearing variety of katiarsite are associated closely with one another and with badalovite, pansnerite, yurmarinite, achyrophanite, arsenatrotitanite, hatertite, khrenovite, svabite, sanidine, hematite, cassiterite, rutile and aphthitalite-group sulfates. Yurgensonite occurs as sword-shaped crystals up to 0.01 mm × 0.05 mm × 1 mm or acicular to hair-like individuals up to 1 mm long, typically forming radial aggregates up to 2 mm across. It is transparent, colourless, white or pale beige, with vitreous lustre. The mineral is brittle, cleavage was not observed. Dcalc is 3.877 g cm-3. Yurgensonite is optically biaxial (–), α = 1.764(6), β = 1.780(6), γ = 1.792(6) and 2Vmeas. is large. Chemical composition (wt.%, electron-microprobe; holotype) is: Na2O 0.51, K2O 16.27, Rb2O 0.12, Al2O3 0.26, Fe2O3 4.33, SiO2 0.29, TiO2 10.17, SnO2 22.01, P2O5 0.14, V2O5 0.19, As2O5 40.20, Sb2O5 4.88, SO3 0.28, total 99.65. The empirical formula based on 10 O apfu is (K1.92Na0.09Rb0.01)Σ2.02(Sn0.81Ti0.71Fe3+0.30Sb5+0.17Al0.03)Σ2.02(As1.945Si0.03S0.02P0.01V0.01)Σ2.015O10. Yurgensonite is orthorhombic, Pna21, a = 13.2681(6), b = 6.6209(3), c = 10.8113(5) Å, V = 949.74(7) Å3 and Z = 4. The crystal structure was solved from single-crystal X-ray diffraction data, R = 5.02%. Yurgensonite belongs to the KTP-structure type. It is a Ti,Sn-ordered analogue of katiarsite. The structure contains chains of corner-linked alternating crystallographically non-equivalent octahedra M(1) and M(2). In yurgensonite, Sn4+ prevails in the M(2)O6 octahedron whereas the M(1) site is Ti4+-dominant. The new mineral is named in honour of the Russian mineralogist, geochemist and specialist in studies of ore deposits Professor Georgiy Aleksandrovich Yurgenson (born 1935).

新矿物鱼生铝榴石，理想情况下是 K 2 SnTiO 2 (AsO 4 ) 2，这是第一个具有物种定义锡的天然砷酸盐，以及鱼生铝榴石和钾钛矿 KTiO(AsO 4 )之间的连续同晶系列) 是从俄罗斯堪察加半岛托尔巴奇克火山大托尔巴奇克裂隙喷发北部突破的第二个火山渣锥处的 Arsenatnaya 喷气孔升华物中描述的。Yurgensonite 和一种含 Sn 的 katiarsite 彼此密切相关，并且与 Badalovite、pansnerite、yurmarinite、achyrophanite、arsentrotitanite、hatertite、khrenovite、svabite、sanidine、赤铁矿、锡石、金红石和 aphthitalite-group 硫酸盐密切相关。Yurgensonite 以高达 0.01 毫米 × 0.05 毫米 × 1 毫米的剑形晶体或针状至长达 1 毫米的毛发状晶体形式出现，通常形成直径达 2 毫米的径向聚集体。它是透明、无色、白色或浅米色，具有玻璃光泽。矿物脆，未观察到解理。D calc是 3.877 g cm-3 . Yurgensonite 是光学双轴 (–)，α = 1.764(6)，β = 1.780(6)，γ = 1.792(6) 和 2V测量值。很大。化学成分（wt.%，电子探针；正模）为：Na 2 O 0.51、K 2 O 16.27、Rb 2 O 0.12、Al 2 O 3 0.26、Fe 2 O 3 4.33、SiO 2 0.29、TiO 2 10.17、 SnO 2 22.01, P 2 O 5 0.14, V 2 O 5 0.19, As 2 O 5 40.20, Sb 2 O 5 4.88, SO 30.28，总分 99.65。基于10 O apfu经验式是（K 1.92钠0.09 RB 0.01）Σ2.02（SN 0.81钛0.71的Fe 3+ 0.30锑5+ 0.17的Al 0.03）Σ2.02（如1.945硅0.03 š 0.02 P 0.01 V 0.01 ) Σ2.015 O 10。Yurgensonite为斜方晶，PNA 2 1，一个= 13.2681（6），b = 6.6209（3），C ^= 10.8113(5) Å，V = 949.74(7) Å 3和Z = 4。晶体结构由单晶 X 射线衍射数据解析，R = 5.02%。Yurgensonite 属于 KTP 结构类型。它是钛铁矿的 Ti,Sn 有序类似物。该结构包含角连接的交替晶体学非等价八面体M (1) 和M (2) 的链。在柚子石中，Sn 4+在M (2)O 6八面体中占优势，而M (1) 位点是 Ti 4+-主导的。这种新矿物的名字是为了纪念俄罗斯矿物学家、地球化学家和矿床研究专家 Georgiy Aleksandrovich Yurgenson 教授（生于 1935 年）。