A new trigonal (3T) polytype of chloritoid, Fe2+Al2(SiO4)O(OH)2, from the Kosoy Brod deposit, Middle Urals, Russia: chemical composition, crystal structure and complexity analysis

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A new trigonal (3T) polytype of chloritoid, Fe2+Al2(SiO4)O(OH)2, from the Kosoy Brod deposit, Middle Urals, Russia: chemical composition, crystal structure and complexity analysis. / Zolotarev, Andrey A.; Zhitova, Elena S.; Selivanova, Ekaterina A.; Krivovichev, Sergey V.; Zhegunov, Pavel S.; Savchenko, Yevgeny E.; Nikolaev, Alexander P.

In: American Mineralogist, 16.07.2025.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{0f94e11aa2f54575aea088e02aaa24e5,

title = "A new trigonal (3T) polytype of chloritoid, Fe2+Al2(SiO4)O(OH)2, from the Kosoy Brod deposit, Middle Urals, Russia: chemical composition, crystal structure and complexity analysis",

abstract = "A new trigonal (3T) polytype of chloritoid, Fe2+ Al2(SiO4)O(OH)2, a rock-forming schist mineral, has been found in the samples from the chloritoid type locality, Kosoy Brod deposit, Middle Urals, Russia. The single-crystal X-ray diffraction indicated that the mineral crystallizes in the space group P32, a = 5.4890(2), c = 26.7612(14) {\AA}, V = 698.27(6) {\AA}3. The structure was solved and refined to R1 = 0.0564 (wR2 = 0.1545) for 2534 unique reflections with I > 2σ(I). After known triclinic (1A) and monoclinic (2M2) modifications, chloritoid-3T is the third chloritoid polytype. The crystal structures of all three polytypes are based upon the same types of octahedral and tetrahedral layers. The main difference between the polytypes is in the stacking of dioctahedral layers L1 and trioctahedral layers L2 interconnected with tetrahedral net. The new polytype (3T) can be detected by its powder X-ray diffraction pattern. The complexity analysis indicates that the crystal structure of chloritoid-3T is the most complex among known polytypes. The discovery of a new chloritoid polytype is essential for the potential development of chloritoid-based geothermometers and the general conception of polytypism",

author = "Zolotarev, {Andrey A.} and Zhitova, {Elena S.} and Selivanova, {Ekaterina A.} and Krivovichev, {Sergey V.} and Zhegunov, {Pavel S.} and Savchenko, {Yevgeny E.} and Nikolaev, {Alexander P.}",

year = "2025",

month = jul,

day = "16",

doi = "10.2138/am-2025-9751",

language = "English",

journal = "American Mineralogist",

issn = "0003-004X",

publisher = "Mineralogical Society of America",

}

RIS

TY - JOUR

T1 - A new trigonal (3T) polytype of chloritoid, Fe2+Al2(SiO4)O(OH)2, from the Kosoy Brod deposit, Middle Urals, Russia: chemical composition, crystal structure and complexity analysis

AU - Zolotarev, Andrey A.

AU - Zhitova, Elena S.

AU - Selivanova, Ekaterina A.

AU - Krivovichev, Sergey V.

AU - Zhegunov, Pavel S.

AU - Savchenko, Yevgeny E.

AU - Nikolaev, Alexander P.

PY - 2025/7/16

Y1 - 2025/7/16

N2 - A new trigonal (3T) polytype of chloritoid, Fe2+ Al2(SiO4)O(OH)2, a rock-forming schist mineral, has been found in the samples from the chloritoid type locality, Kosoy Brod deposit, Middle Urals, Russia. The single-crystal X-ray diffraction indicated that the mineral crystallizes in the space group P32, a = 5.4890(2), c = 26.7612(14) Å, V = 698.27(6) Å3. The structure was solved and refined to R1 = 0.0564 (wR2 = 0.1545) for 2534 unique reflections with I > 2σ(I). After known triclinic (1A) and monoclinic (2M2) modifications, chloritoid-3T is the third chloritoid polytype. The crystal structures of all three polytypes are based upon the same types of octahedral and tetrahedral layers. The main difference between the polytypes is in the stacking of dioctahedral layers L1 and trioctahedral layers L2 interconnected with tetrahedral net. The new polytype (3T) can be detected by its powder X-ray diffraction pattern. The complexity analysis indicates that the crystal structure of chloritoid-3T is the most complex among known polytypes. The discovery of a new chloritoid polytype is essential for the potential development of chloritoid-based geothermometers and the general conception of polytypism

AB - A new trigonal (3T) polytype of chloritoid, Fe2+ Al2(SiO4)O(OH)2, a rock-forming schist mineral, has been found in the samples from the chloritoid type locality, Kosoy Brod deposit, Middle Urals, Russia. The single-crystal X-ray diffraction indicated that the mineral crystallizes in the space group P32, a = 5.4890(2), c = 26.7612(14) Å, V = 698.27(6) Å3. The structure was solved and refined to R1 = 0.0564 (wR2 = 0.1545) for 2534 unique reflections with I > 2σ(I). After known triclinic (1A) and monoclinic (2M2) modifications, chloritoid-3T is the third chloritoid polytype. The crystal structures of all three polytypes are based upon the same types of octahedral and tetrahedral layers. The main difference between the polytypes is in the stacking of dioctahedral layers L1 and trioctahedral layers L2 interconnected with tetrahedral net. The new polytype (3T) can be detected by its powder X-ray diffraction pattern. The complexity analysis indicates that the crystal structure of chloritoid-3T is the most complex among known polytypes. The discovery of a new chloritoid polytype is essential for the potential development of chloritoid-based geothermometers and the general conception of polytypism

UR - https://www.mendeley.com/catalogue/1b0a057d-a201-32fc-8938-2d9fb81e62c1/

U2 - 10.2138/am-2025-9751

DO - 10.2138/am-2025-9751

M3 - Article

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

ER -

ID: 138726845