Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, two new isotypic minerals and the K–Cs isomorphism in this solid-solution series. / Pekov, Igor V.; Zubkova, Natalia V.; Agakhanov, Atali A.; Pushcharovsky, Dmitry Y.; Yapaskurt, Vasiliy O.; Belakovskiy, Dmitry I.; Vigasina, Marina F.; Sidorov, Evgeny G.; Britvin, Sergey N.
в: European Journal of Mineralogy, Том 30, № 3, 01.06.2018, стр. 593-607.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, two new isotypic minerals and the K–Cs isomorphism in this solid-solution series
AU - Pekov, Igor V.
AU - Zubkova, Natalia V.
AU - Agakhanov, Atali A.
AU - Pushcharovsky, Dmitry Y.
AU - Yapaskurt, Vasiliy O.
AU - Belakovskiy, Dmitry I.
AU - Vigasina, Marina F.
AU - Sidorov, Evgeny G.
AU - Britvin, Sergey N.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - Two new isotypic minerals cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, were found in fumarole sublimates at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. They are associated with one another and with euchlorine, chalcocyanite, alumoklyuchevskite, anglesite, fedotovite, wulffite, langbeinite, aphthitalite, steklite, hematite. Both minerals are visually indistinguishable from one another and form coarse tabular or prismatic crystals or grains up to 0.3 mm. They are brittle, transparent, light green to green, with vitreous lustre. Calculated densities for cryptochalcite and cesiodymite are 3.41 and 3.59 g cm-3, respectively. Both are optically biaxial (–); cryptochalcite: α 1.610(3), β 1.632 (4), γ 1.643(4), 2Vmeas 65(5)°; cesiodymite: α 1.61(1), β 1.627(4), γ 1.635(4), 2Vmeas 70(10)°. The empirical formulae, based on 21 O apfu, are: cryptochalcite, (K1.83Na0.09Rb0.09Cs0.06)Σ2.07(Cu3.86Zn1.02Mg0.19)S5.07S4.97O21; cesiodymite, (K1.14Rb0.16Cs0.73)Σ2.03(Cu3.69 Zn1.33)Σ5.02S4.99O21Both minerals are triclinic, P-1, Z = 4; cryptochalcite: a 10.0045(3), b 12.6663(4), c 14.4397(5) Å, a 102.194 (3), b 101.372(3), g 90.008(3)°, V 1751.7(1) Å3; cesiodymite: a 10.0682(4), b 12.7860(7), c 14.5486(8) Å, α 102.038(5), β 100.847(4), γ 89.956(4)°, V 1797.5(2) Å3Their crystal structures are topologically identical and have been refined from single-crystal X-ray diffraction data to final agreement indices R = 0.0503 for cryptochalcite and 0.0898 for cesiodymite. They are based upon the heteropolyhedral {Cu5O (SO4)5}2 framework composed by two types of alternating Cu2+-S-O polyhedral layers {Cu2(SO4)2}0 and {Cu3O(SO4)}2+ connected via SO4 tetrahedra. K and Cs cations occupy sites in the tunnels of the framework. Cryptochalcite is named from Greek, concealed, and copper: it is associated with other green copper oxysulfates and is visually very similar to them. Cesiodymite is named from cesium and Greek, a twin brother, being a Cs-K-ordered analogue of cryptochalcite.
AB - Two new isotypic minerals cryptochalcite, K2Cu5O(SO4)5, and cesiodymite, CsKCu5O(SO4)5, were found in fumarole sublimates at the Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. They are associated with one another and with euchlorine, chalcocyanite, alumoklyuchevskite, anglesite, fedotovite, wulffite, langbeinite, aphthitalite, steklite, hematite. Both minerals are visually indistinguishable from one another and form coarse tabular or prismatic crystals or grains up to 0.3 mm. They are brittle, transparent, light green to green, with vitreous lustre. Calculated densities for cryptochalcite and cesiodymite are 3.41 and 3.59 g cm-3, respectively. Both are optically biaxial (–); cryptochalcite: α 1.610(3), β 1.632 (4), γ 1.643(4), 2Vmeas 65(5)°; cesiodymite: α 1.61(1), β 1.627(4), γ 1.635(4), 2Vmeas 70(10)°. The empirical formulae, based on 21 O apfu, are: cryptochalcite, (K1.83Na0.09Rb0.09Cs0.06)Σ2.07(Cu3.86Zn1.02Mg0.19)S5.07S4.97O21; cesiodymite, (K1.14Rb0.16Cs0.73)Σ2.03(Cu3.69 Zn1.33)Σ5.02S4.99O21Both minerals are triclinic, P-1, Z = 4; cryptochalcite: a 10.0045(3), b 12.6663(4), c 14.4397(5) Å, a 102.194 (3), b 101.372(3), g 90.008(3)°, V 1751.7(1) Å3; cesiodymite: a 10.0682(4), b 12.7860(7), c 14.5486(8) Å, α 102.038(5), β 100.847(4), γ 89.956(4)°, V 1797.5(2) Å3Their crystal structures are topologically identical and have been refined from single-crystal X-ray diffraction data to final agreement indices R = 0.0503 for cryptochalcite and 0.0898 for cesiodymite. They are based upon the heteropolyhedral {Cu5O (SO4)5}2 framework composed by two types of alternating Cu2+-S-O polyhedral layers {Cu2(SO4)2}0 and {Cu3O(SO4)}2+ connected via SO4 tetrahedra. K and Cs cations occupy sites in the tunnels of the framework. Cryptochalcite is named from Greek, concealed, and copper: it is associated with other green copper oxysulfates and is visually very similar to them. Cesiodymite is named from cesium and Greek, a twin brother, being a Cs-K-ordered analogue of cryptochalcite.
KW - Alkali copper sulfate
KW - Cesiodymite
KW - Cesium potassium isomorphous substitution
KW - Cryptochalcite
KW - Crystal structure
KW - Fumarole
KW - Kamchatka
KW - New mineral
KW - Oxysulfate
KW - Tolbachik volcano
UR - http://www.scopus.com/inward/record.url?scp=85053502958&partnerID=8YFLogxK
U2 - 10.1127/ejm/2018/0030-2725
DO - 10.1127/ejm/2018/0030-2725
M3 - Article
AN - SCOPUS:85053502958
VL - 30
SP - 593
EP - 607
JO - European Journal of Mineralogy
JF - European Journal of Mineralogy
SN - 0935-1221
IS - 3
ER -
ID: 39031270