TY - JOUR

T1 - Zincomenite, ZnSeO3, a new mineral from the Tolbachik volcano, Kamchatka, Russia

AU - Pekov, Igor V.

AU - Zubkova, Natalia V.

AU - Yapaskurt, Vasiliy O.

AU - Britvin, Sergey N.

AU - Chukanov, Nikita V.

AU - Lykova, Inna S.

AU - Sidorov, Evgeny G.

AU - Pushcharovsky, Dmitry Y.

PY - 2016

Y1 - 2016

N2 - The new mineral zincomenite, β-ZnSeO3, is found in active fumaroles belonging to the Northern fumarole field at the First scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with sofiite, sellaite, fluorite, halite, anhydrite, cotunnite, chubarovite, flinteite, etc. Zincomenite occurs as tabular, equant or prismatic crystals up to 0.2 mm sometimes combined in clusters up to 0.3 mm across, or interrupted incrustations up to 0.7 × 1 cm overgrowing basalt scoria. Partial to complete pseudomorphs of zincomenite after sofiite are typical. The crystal forms are {101}, {010}, {100} and {013}. T-shaped twins with (012) as twin plane were found. Zincomenite is transparent, colourless, white or pale beige with adamantine lustre. Cleavage and parting were not observed and the fracture is uneven. Dcalc is 4.760 g cm-3. Zincomenite is optically biaxial (-), a = 1.744(5), β = 1.860(5), γ = 1.875(5). The IR spectrum is reported. The chemical composition (wt.%, electron microprobe data) is: ZnO 42.53, SeO2 56.67, total 99.20. The empirical formula calculated on the basis of 3 O apfu is: Zn1.02Se0.99O3. Zincomenite is orthorhombic, Pbca, a = 7.1971(2), b = 6.2320(2), γ = 11.9914(3) Å, V = 537.84(2) Å3 and Z = 8. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 4.612(26)(102), 3.601(77)(200), 3.119(48)(210), 3.048 (38)(113), 3.014(100)(211, 021), 2.996(56)(004), 2.771(19)(123, 104, 212), 2.459(23)(213, 023), 2.311(20)(123, 221, 204), and 2.162 (19)(214, 024). Zincomenite is a representative of the CuSeO3 structure type. Its crystal structure, solved from single-crystal X-ray diffraction data (R = 0.0188), contains layers formed by Zn2O8 dimers (consisting of edge-sharing ZnO5 trigonal bipyramids; each dimer shares four vertices with the neighbouring ones) linked via (SeO3)2- groups (with Se4+in trigonal pyramidal coordination) to form an open framework. The mineral is named in allusion to its chemical composition: zinc selenite (the Greek μ γγaγ means moon, indicating selenium).

AB - The new mineral zincomenite, β-ZnSeO3, is found in active fumaroles belonging to the Northern fumarole field at the First scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. It is associated with sofiite, sellaite, fluorite, halite, anhydrite, cotunnite, chubarovite, flinteite, etc. Zincomenite occurs as tabular, equant or prismatic crystals up to 0.2 mm sometimes combined in clusters up to 0.3 mm across, or interrupted incrustations up to 0.7 × 1 cm overgrowing basalt scoria. Partial to complete pseudomorphs of zincomenite after sofiite are typical. The crystal forms are {101}, {010}, {100} and {013}. T-shaped twins with (012) as twin plane were found. Zincomenite is transparent, colourless, white or pale beige with adamantine lustre. Cleavage and parting were not observed and the fracture is uneven. Dcalc is 4.760 g cm-3. Zincomenite is optically biaxial (-), a = 1.744(5), β = 1.860(5), γ = 1.875(5). The IR spectrum is reported. The chemical composition (wt.%, electron microprobe data) is: ZnO 42.53, SeO2 56.67, total 99.20. The empirical formula calculated on the basis of 3 O apfu is: Zn1.02Se0.99O3. Zincomenite is orthorhombic, Pbca, a = 7.1971(2), b = 6.2320(2), γ = 11.9914(3) Å, V = 537.84(2) Å3 and Z = 8. The strongest reflections of the powder X-ray diffraction pattern [d,Å(I)(hkl)] are: 4.612(26)(102), 3.601(77)(200), 3.119(48)(210), 3.048 (38)(113), 3.014(100)(211, 021), 2.996(56)(004), 2.771(19)(123, 104, 212), 2.459(23)(213, 023), 2.311(20)(123, 221, 204), and 2.162 (19)(214, 024). Zincomenite is a representative of the CuSeO3 structure type. Its crystal structure, solved from single-crystal X-ray diffraction data (R = 0.0188), contains layers formed by Zn2O8 dimers (consisting of edge-sharing ZnO5 trigonal bipyramids; each dimer shares four vertices with the neighbouring ones) linked via (SeO3)2- groups (with Se4+in trigonal pyramidal coordination) to form an open framework. The mineral is named in allusion to its chemical composition: zinc selenite (the Greek μ γγaγ means moon, indicating selenium).

KW - Crystal structure

KW - Fumarole sublimate

KW - Kamchatka

KW - New mineral

KW - Tolbachik volcano

KW - Zinc selenite

KW - Zincomenite

UR - http://www.scopus.com/inward/record.url?scp=85010877171&partnerID=8YFLogxK

U2 - 10.1127/ejm/2016/0028-2564

DO - 10.1127/ejm/2016/0028-2564

M3 - Article

AN - SCOPUS:85010877171

VL - 28

SP - 997

EP - 1004

JO - European Journal of Mineralogy

JF - European Journal of Mineralogy

SN - 0935-1221

IS - 5

ER -