Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Cyprine, Ca19Cu2+(Al,Mg,Mn)12Si18O69(OH)9, a new vesuvianite-group mineral from the Wessels mine, South Africa. / Panikorovskii, Taras L.; Shilovskikh, Vladimir V.; Avdontseva, Evgenia Yu; Zolotarev, Andrey A.; Pekov, Igor V.; Britvin, Sergey N.; Hålenius, Ulf; Krivovichev, Sergey V.
в: European Journal of Mineralogy, Том 29, № 2, 2017, стр. 295-306.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Cyprine, Ca19Cu2+(Al,Mg,Mn)12Si18O69(OH)9, a new vesuvianite-group mineral from the Wessels mine, South Africa
AU - Panikorovskii, Taras L.
AU - Shilovskikh, Vladimir V.
AU - Avdontseva, Evgenia Yu
AU - Zolotarev, Andrey A.
AU - Pekov, Igor V.
AU - Britvin, Sergey N.
AU - Hålenius, Ulf
AU - Krivovichev, Sergey V.
PY - 2017
Y1 - 2017
N2 - Cyprine, ideallyCa19Cu2+(Al,Mg,Mn)12Si18O69(OH)9,was found at theWessels mine near Hotazel,KalahariManganese Field, North Cape province, South Africa. It occurs as chaotic aggregates (up to 5 cm across) in open cavities or embedded in coarse-grained colourless calcite. Associated minerals are calcite, apatite, andradite, henritermierite and rhodochrosite. Single crystals of cyprine up to 1 cm are dark red with a lilac hue and vitreous lustre.Dominant crystal forms are {1 0 0}, {11 0} and {3 3 1}. TheMohs hardness is 6.5.Dmeas and Dcalc are 3.40(3) and 3.41 g/cm3, respectively. Cyprine is optically uniaxial, negative, ω = 1.744(2), e = 1.732(2) (inwhite light). Pleochroism is strong; ranging from O= dark purple, E= pale red to O= dark reddish brown, E= pale yellowish brown; O>E. Chemical composition (electron microprobe, H2O by thermogravimetric analysis (TGA)) of two chemically different zones (zone-1/zone-2, wt.%) is: SiO236.98/36.51; Al2O3 14.98/13.70; CaO 36.70/36.18; MgO 3.24/1.10; Mn2O3 2.27/6.04; CuO 2.39/1.86; Fe2O3 0.62/2.50; Cr2O3 0.23/0.04; H2O 3.30/3.30, total 100.71/101.23. The crystal-chemical formulae (based on the FTIR, TGA/differential scanning calorimetry, SREF, WDS and optical spectra) are Ca18.00Ca1.00(Cu0.95Mg0.05)Σ1.00Al4.00(Al5.50Mg1.00Mn3+ 1.19Fe3+ 0.22Cr0.09)Σ8.00([SiO4]9.91[H4O4]0.09)Σ10.00 [Si2O7]4((OH)9O)Σ10.00 and Ca18.00Ca1.00(Cu0.90Mg0.10)Σ1.00(Al3.22Mn3+ 0.60Fe3+ 0.18)Σ4.00(Al4.72Mn3+ 1.20Fe3+ 1.06Mn2+ 0.60Mg0.40Cr0.02) S8.00([SiO4]9.91[H4O4]0.09)Σ10.00[Si2O7]4((OH)9O)Σ10.00 for zone-1 and zone-2, respectively. Absorption bands in the IR spectrum are 443, 490, 574, 604, 671, 814, 905, 972, 1015, 3354, 3640cm-1. The polarized optical absorption spectra have two strong absorption bands at 415 and 555 nm and a less intense band at 645 nm. The eight strongest lines of the powder X-ray diffraction pattern are (I-d(Å)-h k l): 12-5.89-002, 12-3.007-4 3 1, 47-2.950-004, 100-2.75-4 3 2, 76-2.594-522, 35-2.459-6 2 0, 10-2.324-144, 28-1.6224-672. Cyprine is tetragonal, space group P4/n, unit-cell parameters refined from the powder data are a = 15.5652(5), c = 11.7921(4), V= 2863.2 (2)Å3,Z = 2.The crystal structure hasbeen refined toR1=0.034andR1 = 0.035for2848and2071unique observedreflectionswith |Fo|=4sF for the zones 1 and 2, respectively. The structure refinements provide scattering factors of the Y1A,B sites close to 29 e-, which supports occupancy of these sites byCu2+ ions.The copper coordination polyhedra possess strong Jahn-Teller distortion: Y1A-O6(4-) = 2.043(3)Å and Y1A-O10 = 2.258(6)Å for zone-1 and Y1B-O6(4-)=2.010(4)Å and Y1B-O10 = 2.274(7)Å for zone-2. Cyprine is defined as a member of the vesuvianite group with Cu2+ as a dominant cation in the Y1 site. The historical name cyprine (derived from Latin cuprum, copper) given by J.J. Berzelius in 1821 for Cu-bearing vesuvianite is transferred to the new mineral.
AB - Cyprine, ideallyCa19Cu2+(Al,Mg,Mn)12Si18O69(OH)9,was found at theWessels mine near Hotazel,KalahariManganese Field, North Cape province, South Africa. It occurs as chaotic aggregates (up to 5 cm across) in open cavities or embedded in coarse-grained colourless calcite. Associated minerals are calcite, apatite, andradite, henritermierite and rhodochrosite. Single crystals of cyprine up to 1 cm are dark red with a lilac hue and vitreous lustre.Dominant crystal forms are {1 0 0}, {11 0} and {3 3 1}. TheMohs hardness is 6.5.Dmeas and Dcalc are 3.40(3) and 3.41 g/cm3, respectively. Cyprine is optically uniaxial, negative, ω = 1.744(2), e = 1.732(2) (inwhite light). Pleochroism is strong; ranging from O= dark purple, E= pale red to O= dark reddish brown, E= pale yellowish brown; O>E. Chemical composition (electron microprobe, H2O by thermogravimetric analysis (TGA)) of two chemically different zones (zone-1/zone-2, wt.%) is: SiO236.98/36.51; Al2O3 14.98/13.70; CaO 36.70/36.18; MgO 3.24/1.10; Mn2O3 2.27/6.04; CuO 2.39/1.86; Fe2O3 0.62/2.50; Cr2O3 0.23/0.04; H2O 3.30/3.30, total 100.71/101.23. The crystal-chemical formulae (based on the FTIR, TGA/differential scanning calorimetry, SREF, WDS and optical spectra) are Ca18.00Ca1.00(Cu0.95Mg0.05)Σ1.00Al4.00(Al5.50Mg1.00Mn3+ 1.19Fe3+ 0.22Cr0.09)Σ8.00([SiO4]9.91[H4O4]0.09)Σ10.00 [Si2O7]4((OH)9O)Σ10.00 and Ca18.00Ca1.00(Cu0.90Mg0.10)Σ1.00(Al3.22Mn3+ 0.60Fe3+ 0.18)Σ4.00(Al4.72Mn3+ 1.20Fe3+ 1.06Mn2+ 0.60Mg0.40Cr0.02) S8.00([SiO4]9.91[H4O4]0.09)Σ10.00[Si2O7]4((OH)9O)Σ10.00 for zone-1 and zone-2, respectively. Absorption bands in the IR spectrum are 443, 490, 574, 604, 671, 814, 905, 972, 1015, 3354, 3640cm-1. The polarized optical absorption spectra have two strong absorption bands at 415 and 555 nm and a less intense band at 645 nm. The eight strongest lines of the powder X-ray diffraction pattern are (I-d(Å)-h k l): 12-5.89-002, 12-3.007-4 3 1, 47-2.950-004, 100-2.75-4 3 2, 76-2.594-522, 35-2.459-6 2 0, 10-2.324-144, 28-1.6224-672. Cyprine is tetragonal, space group P4/n, unit-cell parameters refined from the powder data are a = 15.5652(5), c = 11.7921(4), V= 2863.2 (2)Å3,Z = 2.The crystal structure hasbeen refined toR1=0.034andR1 = 0.035for2848and2071unique observedreflectionswith |Fo|=4sF for the zones 1 and 2, respectively. The structure refinements provide scattering factors of the Y1A,B sites close to 29 e-, which supports occupancy of these sites byCu2+ ions.The copper coordination polyhedra possess strong Jahn-Teller distortion: Y1A-O6(4-) = 2.043(3)Å and Y1A-O10 = 2.258(6)Å for zone-1 and Y1B-O6(4-)=2.010(4)Å and Y1B-O10 = 2.274(7)Å for zone-2. Cyprine is defined as a member of the vesuvianite group with Cu2+ as a dominant cation in the Y1 site. The historical name cyprine (derived from Latin cuprum, copper) given by J.J. Berzelius in 1821 for Cu-bearing vesuvianite is transferred to the new mineral.
KW - Berzelius
KW - Copper
KW - Crystal structure
KW - Cyprine
KW - IR
KW - New mineral
KW - Optical spectra
KW - South Africa
KW - TGA/DSC
KW - Vesuvianite
KW - Wessels mine
UR - http://www.scopus.com/inward/record.url?scp=85019145376&partnerID=8YFLogxK
U2 - 10.1127/ejm/2017/0029-2592
DO - 10.1127/ejm/2017/0029-2592
M3 - Article
AN - SCOPUS:85019145376
VL - 29
SP - 295
EP - 306
JO - European Journal of Mineralogy
JF - European Journal of Mineralogy
SN - 0935-1221
IS - 2
ER -
ID: 9131174