TY - JOUR

T1 - Chirvinskyite, (Na,ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3-(Si2O7)4(OH,O,F)12, a new mineral with a modular wallpaper structure, from the khibiny alkaline massif (kola peninsula, Russia)

AU - Yakovenchuk, Victor N.

AU - Pakhomovsky, Yakov A.

AU - Panikorovskii, Taras L.

AU - Zolotarev, Andrey A.

AU - Mikhailova, Julia A.

AU - Bocharov, Vladimir N.

AU - Krivovichev, Sergey V.

AU - Ivanyuk, Gregory Yu.

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, is a new wöhlerite-related zirconotitano-sorosilicate. It is triclinic, P 1¯, a = 7.0477(5), b = 9.8725(5), c = 12.2204(9) Å, α = 77.995(5), β = 82.057(6), γ = 89.988(5)°, V = 823.35(9) Å3, Z = 1. The mineral was found in albitized alkaline pegmatites in a foyaite of the Mt. Takhtarvumchorr (Khibiny alkaline massif, Kola Peninsula, Russia, N 67°40′, E 33°33′). Chirvinskyite forms sheaf-like and radiated aggregates (up to 6 mm in diameter) of split fibrous crystals hosted by saccharoidal fluorapatite and albite. The mineral is pale cream in color, with a silky luster and a white streak. The cleavage is not recognized. Mohs hardness is 5. Chirvinskyite is biaxial (-), α 1.670(2), β 1.690(2), γ 1.705(2) (589 nm), 2Vcalc = 80.9°. The calculated and measured densities are 3.41 and 3.07(2) g·cm−3, respectively. The empirical formula based on Si = 8 apfu is (Na9.81Ca3.28K0.01)∑13.10(Fe0.72Mn0.69□0.54Mg0.05)∑2.00(Ti1.81Nb0.19)∑2.00(Zr2.27Ti0.63)∑2.90(Si2O7)4{(OH)5.94O3.09F2.97}∑12.00. Chirvinskyite belongs to a new structure type of minerals and inorganic compounds and is related to the wöhlerite-group minerals. Its modular “wallpaper” structure consists of disilicate groups Si2O7 and three types of “octahedral walls”. The mineral is named in honor of Petr Nikolaevich Chirvinsky (1880-1955), Russian geologist and petrographer, head of the Petrography Department of the Perm’ State University (1943-1953), for his contributions to mineralogy and petrology, including studies of the Khibiny alkaline massif.

AB - Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, is a new wöhlerite-related zirconotitano-sorosilicate. It is triclinic, P 1¯, a = 7.0477(5), b = 9.8725(5), c = 12.2204(9) Å, α = 77.995(5), β = 82.057(6), γ = 89.988(5)°, V = 823.35(9) Å3, Z = 1. The mineral was found in albitized alkaline pegmatites in a foyaite of the Mt. Takhtarvumchorr (Khibiny alkaline massif, Kola Peninsula, Russia, N 67°40′, E 33°33′). Chirvinskyite forms sheaf-like and radiated aggregates (up to 6 mm in diameter) of split fibrous crystals hosted by saccharoidal fluorapatite and albite. The mineral is pale cream in color, with a silky luster and a white streak. The cleavage is not recognized. Mohs hardness is 5. Chirvinskyite is biaxial (-), α 1.670(2), β 1.690(2), γ 1.705(2) (589 nm), 2Vcalc = 80.9°. The calculated and measured densities are 3.41 and 3.07(2) g·cm−3, respectively. The empirical formula based on Si = 8 apfu is (Na9.81Ca3.28K0.01)∑13.10(Fe0.72Mn0.69□0.54Mg0.05)∑2.00(Ti1.81Nb0.19)∑2.00(Zr2.27Ti0.63)∑2.90(Si2O7)4{(OH)5.94O3.09F2.97}∑12.00. Chirvinskyite belongs to a new structure type of minerals and inorganic compounds and is related to the wöhlerite-group minerals. Its modular “wallpaper” structure consists of disilicate groups Si2O7 and three types of “octahedral walls”. The mineral is named in honor of Petr Nikolaevich Chirvinsky (1880-1955), Russian geologist and petrographer, head of the Petrography Department of the Perm’ State University (1943-1953), for his contributions to mineralogy and petrology, including studies of the Khibiny alkaline massif.

KW - Albitite

KW - Chirvinskyite

KW - Khibiny massif

KW - Modular crystal structure

KW - New mineral

KW - Titanozircono-sorosilicate

UR - http://www.scopus.com/inward/record.url?scp=85067993051&partnerID=8YFLogxK

UR - https://www.mdpi.com/2075-163X/9/4

U2 - 10.3390/min9040219

DO - 10.3390/min9040219

M3 - Article

AN - SCOPUS:85067993051

VL - 9

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 4

M1 - 219

ER -