Dalnegorskite, Ca5Mn(Si3O9)2, a new pyroxenoid of the bustamite structure type, a rock-forming mineral of calcic skarns of the Dalnegorskoe boron deposit (Primorskiy kray, Russia)

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
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Аннотация

Dalnegorskite — the new pyroxenoid with the crystal-chemical formula Ca2Ca2MnCa(Si3O9)2, and the simplified formula Ca5Mn(Si3O9)2, is a rock-forming mineral in the boron-bearing calcareous skarns of the Dalnegorskoe boron-silicate deposit (Dalnegorsk, Primorsky Krai, Russia). It belongs to the structural type of bustamite and forms a continuous solid-solution series with the isostructural mineral ferrobustamite Ca2Ca2FeCa[Si3O9]2. These pyroxenoids form thinly-radiated banded beige, pinkish-white and milky-white 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 optically biaxial, negative, α = 1.640 (3), β = 1.647 (3), γ = 1.650 (3)°, 2Vmeas. = 75(10)º. The average chemical composition of the holotype (electron microprobe data) is: MgO 0.23, CaO 40.02, MnO 5.02, FeO 3.64, SiO2 50.65, total 99.56 wt.%. The empirical formula calculated on 18 O atoms is Ca5.03Mn0.51Fe0.36Mg0.04Si6.03O18. The crystal structure of the new mineral was refined by powder X-ray diffraction data using the Rietveld method, Rp = 0.0345, Rwp = 0.0444, R1 = 0.0790, 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)º, V = 386.23(11) Å3, Z = 1. Dalnegorskite is distinctly different from the related mineral wollastonite in the infrared spectrum. The wave-numbers of maxima of strong bands in the characteristic region of Si—O stretching vibrations in the IR spectrum of dalnegorskite are (cm–1): 905, 937, 1025, 1070. The type specimen of dalnegorskite is deposited in the collection of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia (No. 96201).

Толық мәтін

Рұқсат жабық

Авторлар туралы

N. Shchipalkina

Moscow State University;Federal scientific research center «Crystallography and photonica» RAS

Хат алмасуға жауапты Автор.
Email: estel58@yandex.ru
Ресей, Moscow;Moscow

I. Pekov

Moscow State University;Institute of Geochemistry and Analytical Chemistry RAS

Email: igorpekov@mail.ru
Ресей, Moscow;Moscow

D. Ksenofontov

Moscow State University

Email: estel58@yandex.ru
Ресей, Moscow

N. Chukanov

Institute of Problems of Chtmical Physics RAS

Email: estel58@yandex.ru
Ресей, Moscow Region, Chernogolovka

D. Belakovskiy

A. E. Fersman Mineralogical Museum RAS

Email: estel58@yandex.ru
Ресей, Moscow

N. Koshlyakova

Moscow State University

Email: estel58@yandex.ru
Ресей, Moscow

Әдебиет тізімі

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