F. C. Hawthorne
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View article: Gorbunovite CsLi<sub>2</sub>(Ti,Fe<sup>+3</sup>)(Si<sub>4</sub>O<sub>10</sub>)(F,OH,O)<sub>2</sub> – a new mica supergroup mineral from the Darai-Pioz alkaline massif, Tajikistan
Gorbunovite CsLi<sub>2</sub>(Ti,Fe<sup>+3</sup>)(Si<sub>4</sub>O<sub>10</sub>)(F,OH,O)<sub>2</sub> – a new mica supergroup mineral from the Darai-Pioz alkaline massif, Tajikistan Open
Gorbunovite, CsLi 2 (Ti,Fe +3 )(Si 4 O 10 )(F,OH,O) 2 , a new caesium trioctahedral mica, was discovered in the Darai-Pioz alkaline massif, Tajikistan. The mineral is named after the Russian chemist, leader of the Tajik-Pamir Expedition, A…
View article: Heat-Induced Mn2+ and Fe2+ Oxidation in Heterophyllosilicates: Kupletskite and Kupletskite-(Cs)
Heat-Induced Mn2+ and Fe2+ Oxidation in Heterophyllosilicates: Kupletskite and Kupletskite-(Cs) Open
The crystal–chemical behavior of two layered titanosilicate minerals with porous crystal structures, kupletskite, K2NaMn72+Ti2(Si4O12)2O2(OH)4F, and kupletskite-(Cs), Cs2NaMn72+Ti2(Si4O12)2O2(OH)4F, was investigated under high-temperature …
View article: The effect of anisotropic electrical conductivity of amphiboles on geophysical anomalies observed in subduction zones
The effect of anisotropic electrical conductivity of amphiboles on geophysical anomalies observed in subduction zones Open
Electrical-conductivity anomalies in subduction zones are believed to be strongly connected with global water cycling, volcanism and seismicity. However, the causal atomic-scale processes related to conductivity of rock-forming minerals in…
View article: Heat-Induced Mn2+ and Fe2+ Oxidation in Heterophyllosilicates with Porous Structure: Kupletskite and Kupletskite-(Cs)
Heat-Induced Mn2+ and Fe2+ Oxidation in Heterophyllosilicates with Porous Structure: Kupletskite and Kupletskite-(Cs) Open
The crystal-chemical behavior of two layered titanosilicate minerals with porous crystal structures: kupletskite, K2NaMn72+Ti2(Si4O12)2O2(OH)4F, and kupletskite-(Cs), Cs2NaMn72+Ti2(Si4O12)2O2(OH)4F, was investigated under high-temperature …
View article: Cummingtonite-(<i>P</i>2<sub>1</sub>/<i>m</i>): Crystal-structure refinement, Mössbauer spectroscopy and infrared spectroscopy, and some aspects of classification of the magnesium-iron-manganese amphiboles
Cummingtonite-(<i>P</i>2<sub>1</sub>/<i>m</i>): Crystal-structure refinement, Mössbauer spectroscopy and infrared spectroscopy, and some aspects of classification of the magnesium-iron-manganese amphiboles Open
The crystal structure of cummingtonite-( P 2 1 / m ) was characterised by single-crystal structure-refinement, infrared spectroscopy and 57 Fe Mössbauer spectroscopy. Previous cummingtonite-( P 2 1 / m ) specimens characterised have Mn 2+ …
View article: The minerals of the kröhnkite supergroup: structural relations and chemical compositions
The minerals of the kröhnkite supergroup: structural relations and chemical compositions Open
The minerals of the kröhnkite, talmessite and fairfieldite groups plus dondoellite, general formula X 2 M 2+ (TO 4 ) 2 (H 2 O) 2 where X = Na, Ca; M 2+ = Mg, Fe, Mn, Co, Ni, Zn, Cu; and T = S, P, As; have been consolidated into the IMA-app…
Ferroinnelite, Ba<sub>4</sub>Ti<sub>2</sub>Na(NaFe<sup>2+</sup>)Ti(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>[(SO<sub>4</sub>)(PO<sub>4</sub>)]O<sub>2</sub>[O(OH)], a new mineral of the lamprophyllite group (seidozerite supergroup) from the Kovdor alkaline massif, Kola Peninsula, Russia: description and crystal structure and new data for innelite, Ba<sub>4</sub>Ti<sub>2</sub>Na(NaMn<sup>2+</sup>)Ti(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>[(SO<sub>4</sub>)(PO<sub>4</sub>)]O<sub>2</sub>[O(OH)] Open
Ferroinnelite, Ba 4 Ti 2 Na(NaFe 2+ )Ti(Si 2 O 7 ) 2 [(SO 4 )(PO 4 )]O 2 [O(OH)], is a new mineral from the Phlogopite deposit, Kovdor alkaline massif, Kola Peninsula, Russia. In an agpaitic pegmatite, ferroinnelite occurs as transparent e…
View article: The crystal structure of pezzottaite and the crystal chemistry of the beryl–pezzottaite series
The crystal structure of pezzottaite and the crystal chemistry of the beryl–pezzottaite series Open
Crystal structures along the join beryl–pezzottaite have been refined and their compositions determined by electron-microprobe analysis. All crystals show sharp uniform diffraction spots but are microscale mixtures of more than one structu…
View article: Ferriphoxite and carboferriphoxite: two new oxalato–phosphate minerals from the Rowley mine, Arizona, USA
Ferriphoxite and carboferriphoxite: two new oxalato–phosphate minerals from the Rowley mine, Arizona, USA Open
Ferriphoxite, [(NH 4 ) 2 K(H 2 O)][Fe 3+ (HPO 4 ) 2 (C 2 O 4 )], and carboferriphoxite, [(NH 4 )K(H 2 CO 3 )][Fe 3+ (HPO 4 )(H 2 PO 4 )(C 2 O 4 )], are new mineral species from the Rowley mine, Maricopa County, Arizona, USA. They occur wit…
View article: Rundqvistite-(Ce), Na<sub>3</sub>(Sr<sub>3</sub>Ce)(Zn<sub>2</sub>Si<sub>8</sub>O<sub>24</sub>), a new mineral from the Darai-Pioz alkaline massif, Tien-Shan Mountains, Tajikistan: mineral description and crystal structure
Rundqvistite-(Ce), Na<sub>3</sub>(Sr<sub>3</sub>Ce)(Zn<sub>2</sub>Si<sub>8</sub>O<sub>24</sub>), a new mineral from the Darai-Pioz alkaline massif, Tien-Shan Mountains, Tajikistan: mineral description and crystal structure Open
Rundqvistite-(Ce), ideally Na 3 (Sr 3 Ce)(Zn 2 Si 8 O 24 ), is a new mineral from the Darai-Pioz alkaline massif, Tien-Shan Mountains, Tajikistan. The mineral occurs as elongated grains up to 0.1 mm long and up to 0.03 mm thick embedded in…
View article: New ion radii for oxides and oxysalts, fluorides, chlorides and nitrides
New ion radii for oxides and oxysalts, fluorides, chlorides and nitrides Open
Ion radii are derived here from the characteristic (grand mean) bond lengths for (i) 135 ions bonded to oxygen in 459 configurations (on the basis of coordination number) using 177 143 bond lengths extracted from 30 805 ordered coordinatio…
View article: <i>Graph</i> <i>T</i>–<i>T</i> (V1.0Beta), a program for embedding and visualizing periodic graphs in 3D Euclidean space
<i>Graph</i> <i>T</i>–<i>T</i> (V1.0Beta), a program for embedding and visualizing periodic graphs in 3D Euclidean space Open
Following the work of Day & Hawthorne [ Acta Cryst. (2022), A 78 , 212–233] and Day et al. [ Acta Cryst. (2024), A 80 , 258–281], the program Graph T – T has been developed to embed graphical representations of observed and hypothetical ch…
View article: Bond topology of chain, ribbon and tube silicates. Part II. Geometrical analysis of infinite 1D arrangements of (<i>T</i>O<sub>4</sub>)<sup> <i>n</i>−</sup> tetrahedra
Bond topology of chain, ribbon and tube silicates. Part II. Geometrical analysis of infinite 1D arrangements of (<i>T</i>O<sub>4</sub>)<sup> <i>n</i>−</sup> tetrahedra Open
In Part I of this series, all topologically possible 1-periodic infinite graphs (chain graphs) representing chains of tetrahedra with up to 6–8 vertices (tetrahedra) per repeat unit were generated. This paper examines possible restraints o…
View article: The effect of A-site cations on charge-carrier mobility in Fe-rich amphiboles
The effect of A-site cations on charge-carrier mobility in Fe-rich amphiboles Open
Elucidating the high-temperature behavior of rock-forming minerals such as amphiboles (AB2C5 T8O22W2) is critical for the understanding of large-scale geological processes in the lithosphere and, in particular, the development of high cond…
View article: Kalyuzhnyite-(Ce), NaKCaSrCeTi(Si<sub>8</sub>O<sub>21</sub>)OF(H<sub>2</sub>O)<sub>3,</sub> a new mineral from the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan: mineral description, crystal structure and a new double (Si<sub>8</sub>O<sub>21</sub>) sheet
Kalyuzhnyite-(Ce), NaKCaSrCeTi(Si<sub>8</sub>O<sub>21</sub>)OF(H<sub>2</sub>O)<sub>3,</sub> a new mineral from the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan: mineral description, crystal structure and a new double (Si<sub>8</sub>O<sub>21</sub>) sheet Open
Kalyuzhnyite-(Ce), ideally NaKCaSrCeTi(Si 8 O 21 )OF(H 2 O) 3 , is a new mineral from the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan. It occurs as equant grains up to 0.05 × 0.07 mm in a quartz–pectolite aggregate in a sil…
Letnikovite-(Ce), (Na□)Ca<sub>2</sub>Ce<sub>2</sub>[Si<sub>7</sub>O<sub>17</sub>(OH)]F<sub>4</sub>(H<sub>2</sub>O)<sub>4,</sub> a new mineral from the Darai-Pioz alkaline massif, Tajikistan: mineral description, crystal structure and a new single [Si<sub>7</sub>O<sub>17</sub>(OH)] sheet Open
Letnikovite-(Ce), ideally (Na□)Ca 2 Ce 2 [Si 7 O 17 (OH)]F 4 (H 2 O) 4 , is a new mineral with no natural or synthetic analogues (IMA2022–132). The mineral occurs at the Darai-Pioz alkaline massif, Tien-Shan mountains, Tajikistan, in a sil…
View article: In situ simultaneous Fe K-edge XAS spectroscopy and resistivity measurements of riebeckite: Implications for anomalous electrical conductivity in subduction zones
In situ simultaneous Fe K-edge XAS spectroscopy and resistivity measurements of riebeckite: Implications for anomalous electrical conductivity in subduction zones Open
In this paper, we address two key features of the behaviour of Fe-rich amphibole at high temperatures: (1) the Fe2+ → Fe3+ + e− exchange within the crystal bulk, and (2) the consequent rise in electrical conductivity. Cycling heating-cooli…
View article: On the definition of distinct mineral species: A critique of current IMA–CNMNC procedures
On the definition of distinct mineral species: A critique of current IMA–CNMNC procedures Open
The criteria for the definition of a new mineral species currently used by the Commission on New Minerals Nomenclature and Classification (CNMNC) of the International Mineralogical Association are critically examined. In particular, the ru…
View article: Nickelalumite, ideally NiAl4(SO4)(OH)12(H2O)3 , a new-old mineral from the Kara-Tangi uranium deposit, Kyrgyzstan
Nickelalumite, ideally NiAl4(SO4)(OH)12(H2O)3 , a new-old mineral from the Kara-Tangi uranium deposit, Kyrgyzstan Open
Nickelalumite, ideally NiAl 4 (SO 4 )(OH) 12 (H 2 O) 3 , is a newly approved mineral from the Batken region, Kyrgyzstan, where it occurs in the Kara-Tangi and Kara-Chagyr uranium deposits. It is found in the zone of hydrothermal alteration…
View article: Magnussonite, Mn2+18 (As3+O3)6Mn1+x(H2O, Clx, ☐): Re-Examination of the Structure and the [Mn1+(As3+O3)6] Cluster
Magnussonite, Mn2+18 (As3+O3)6Mn1+x(H2O, Clx, ☐): Re-Examination of the Structure and the [Mn1+(As3+O3)6] Cluster Open
The crystal structure of magnussonite, ideally Mn2+18[As3+6(Mn1+x)O18]2[(H2O, Clx, ☐) (H2O, ☐)]2, from Långban, Sweden, was refined to an R1-index of 1.19% and the structure proposed by Moore and Araki (1979) is confirmed. Magnussonite has…
View article: Uvite, CaMg<sub>3</sub>(Al<sub>5</sub>Mg)(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy
Uvite, CaMg<sub>3</sub>(Al<sub>5</sub>Mg)(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy Open
Uvite, CaMg 3 (Al 5 Mg)(Si 6 O 18 )(BO 3 ) 3 (OH) 3 (OH), is a new mineral of the tourmaline supergroup. It occurs in the Facciatoia quarry, San Piero in Campo, Elba Island, Italy (42°45′04.55″N, 10°12′50.89″E) at the centre of a narrow (2…
View article: Bond topology of chain, ribbon and tube silicates. Part I. Graph-theory generation of infinite one-dimensional arrangements of (<i>T</i>O<sub>4</sub>)<sup> <i>n</i>−</sup> tetrahedra
Bond topology of chain, ribbon and tube silicates. Part I. Graph-theory generation of infinite one-dimensional arrangements of (<i>T</i>O<sub>4</sub>)<sup> <i>n</i>−</sup> tetrahedra Open
Chain, ribbon and tube silicates are based on one-dimensional polymerizations of ( T O 4 ) n − tetrahedra, where T = Si 4+ plus P 5+ , V 5+ , As 5+ , Al 3+ , Fe 3+ and B 3+ . Such polymerizations may be represented by infinite graphs (desi…
View article: CSD 2163443: Experimental Crystal Structure Determination
CSD 2163443: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…