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Dalnegorskite Ca5Mn(Si3O9)2, a New Pyroxenoid of the Bustamite Structure, a Rock-Forming Mineral of Calcic Skarns in the Dalnegorsk Borosilicate Deposit, Primorsky Krai, Russia

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Abstract

Dalnegorskite, a new pyroxenoid with the crystal chemical formula Ca2Ca2MnCa(Si3O9)2 and simplified formula Ca5Mn(Si3O9)2, is a rock-forming mineral in the B-bearing calcic skarns in the Dalnegorsk borosilicate deposit (Dalnegorsk, Primorsky Krai, Russia). It belongs to the bustamite structural type and forms a continuous solid-solution series with isostructural ferrobustamite Ca2Ca2FeCa[Si3O9]2. These pyroxenoids form beige, pinkish white and milky white radiated aggregates typically consisting of split thin acicular to fiber-like individuals and are associated with hedenbergite, datolite, andradite, galena, sphalerite, and pyrrhotite. Dmeas. = 3.02(2), Dcalc. = 3.035 g cm–3. Dalnegorskite is biaxial negative, α = 1.640 (3), β = 1.647 (3), γ = 1.650 (3)°, 2Vmeas. = 75(10)°. The average chemical composition of the holotype (electron microprobe data) is: 0.23 MgO, 40.02 CaO, 5.02 MnO, 3.64 FeO, 50.65 SiO2, total 99.56 wt %. The empirical formula calculated for 18 O atoms is Ca5.03Mn0.51Fe0.36Mg0.04Si6.01O18. The crystal structure of the new mineral was obtained from X-ray diffraction data using the Rietveld method, Rp= 0.0345, Rwp = 0.0444, R1 = 0.0790, and wR2 = 0.0802. Dalnegorskite is triclinic, P-1, a = 7.2588(11), b = 7.8574(15), c = 7.8765(6) Å, α = 88.550(15), β = 62.582(15), γ = 76.621(6)°, V = 386.23(11) Å3, and Z = 1. Dalnegorskite is distinct from the related mineral wollastonite in the infrared spectrum. The wave numbers of the maxima of strong bands in the Si–O stretching vibration region in the IR spectrum of dalnegorskite are (cm–1): 905, 937, 1025, and 1070. The holotypic specimen of dalnegorskite is kept in the collection of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (no. 96201).

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Funding

The work was supported by the Russian Foundation for Basic Research (project no. 18-05-00332). IR-spectroscopy was carried out under state assignment (state registration no. 0089-2016-0001).

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Authors and Affiliations

  1. Faculty of Geology, Moscow State University, 119991, Moscow, Russia

    N. V. Shchipalkina, I. V. Pekov, D. A. Ksenofontov & N. N. Koshlyakova

  2. Federal Scientific Research Center “Crystallography and Photonics”, Russian Academy of Sciences, 119333, Moscow, Russia

    N. V. Shchipalkina

  3. Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    I. V. Pekov

  4. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    N. V. Chukanov

  5. Fersman Mineralogical Museum, Russian Academy of Sciences, 115162, Moscow, Russia

    D. I. Belakovskii

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  1. N. V. Shchipalkina
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  2. I. V. Pekov
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  3. D. A. Ksenofontov
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  4. N. V. Chukanov
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  5. D. I. Belakovskii
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  6. N. N. Koshlyakova
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Correspondence to N. V. Shchipalkina or I. V. Pekov.

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Translated by E. Maslennikova

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Shchipalkina, N.V., Pekov, I.V., Ksenofontov, D.A. et al. Dalnegorskite Ca5Mn(Si3O9)2, a New Pyroxenoid of the Bustamite Structure, a Rock-Forming Mineral of Calcic Skarns in the Dalnegorsk Borosilicate Deposit, Primorsky Krai, Russia. Geol. Ore Deposits 61, 756–766 (2019). https://doi.org/10.1134/S1075701519080105

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