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Crystal Structures, Compact Packing, Coordination
Underlying any structural criteria based on chemical bonding, there is one fact: the main condition for a crystalline structure to be s is that its...
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High-pressure behavior of gasparite-(Ce) (nominally CeAsO4), a monazite-type arsenate
The high-pressure behavior of the natural arsenate gasparite-(Ce) [Ce 0.43 La 0.24 Nd 0.15 Ca 0.11 Pr 0.04 Sm 0.02 Gd 0.01 (As 0.99 Si 0.03 O 4 )] from the Mt....
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Crystal chemistry and thermal behavior of B-, S- and Na-bearing spurrite
Spurrite from Negra Mine, Queretaro, Mexico is characterized by a complex chemical composition. Its empirical formula derived based on electron...
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The solid solution in the system NaMgAl(SO4)3–KMgAl(SO4)3
We synthesized six samples in the compositional field NaMgAl(SO 4 ) 3 –KMgAl(SO 4 ) 3 in 20 mol% increments from pure Na to pure K compounds. We...
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Thermal expansion of anhydrous copper sulfate minerals determined by single crystal X-ray diffraction: chalcocyanite CuSO4, dolerophanite Cu2OSO4 and kamchatkite KCu3O(SO4)2Cl
Polythermic single-crystal X-ray studies of chalcocyanite CuSO 4 , dolerophanite Cu 2 OSO 4 , and kamchatkite KCu 3 O(SO 4 ) 2 Cl have established their melting...
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Khurayyimite Ca7Zn4(Si2O7)2(OH)10·4H2O: a mineral with unusual loop-branched sechser single chains
The new mineral khurayyimite Ca 7 Zn 4 (Si 2 O 7 ) 2 (OH) 10 ·4H 2 O occurs in colorless spherulitic aggregates in small cavities of altered spurrite marbles...
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Nishanbaevite, KAl2O(AsO4)(SO4), a new As/S-ordered arsenate-sulfate mineral of fumarolic origin
The new mineral nishanbaevite, ideally KAl 2 O(AsO 4 )(SO 4 ), was found in sublimates of the Arsenatnaya fumarole at the Second scoria cone of the...
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Phase transitions and compressibility of alkali-bearing double carbonates at high pressures: a first-principles calculations study
Here, we investigated high-pressure behaviors of four end-members of K-Na-Ca-Mg alkali-bearing double carbonates (K 2 Mg(CO 3 ) 2 , K 2 Ca(CO 3 ) 2 , Na 2 Mg(CO 3 ) 2 ,...
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On the crystal-chemistry of meyerhofferite, CaB3O3(OH)5·H2O
The crystal structure and crystal chemistry of meyerhofferite, ideally CaB 3 O 3 (OH) 5 ·H 2 O, was investigated by a multi-methodological approach based on...
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CuSeO4 and Cu(SeO3OH)2·6H2O, two novel copper–selenium(VI) oxysalts
The two new copper(II) salts Cu(SeO 4 ) and Cu(SeO 3 OH) 2 ·6H 2 O were synthesized at low-temperature hydrothermal conditions (220 °C), and room...
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A comparative study on pressure-induced structural transformations in a basaltic glass and melt from Ab initio molecular dynamics calculations
Glasses are often used as models for understanding the corresponding liquid melts because they are generally assumed to share similar short and...
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In situ XANES study of the influence of varying temperature and oxygen fugacity on iron oxidation state and coordination in a phonolitic melt
Iron oxidation state and environment in magmas affect their phase diagram and their properties, including viscosity and density, which determine...
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Three new copper-lead selenite bromides obtained by chemical vapor transport: Pb5Cu+4(SeO3)4Br6, Pb8Cu2+(SeO3)4Br10, and the synthetic analogue of the mineral sarrabusite, Pb5Cu2+(SeO3)4(Br,Cl)4
Three new copper-lead selenite bromides were synthesized by chemical vapor transport reactions. Pb 5 Cu + 4 (SeO 3 ) 4 Br 6 is monoclinic, space group C 2/ m , a ...
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Crystal structure and optical absorption spectra of LiCo(SO4)OH and its remarkable relationship to the Zn-Mn-silicate hodgkinsonite
Crystals of the compound LiCo(SO 4 )OH were synthesised at low-hydrothermal conditions, and the crystal structure was determined and refined from...
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Impact of high temperatures on aluminoceladonite studied by Mössbauer, Raman, X-ray diffraction and X-ray photoelectron spectroscopy
Mössbauer, Raman, X-ray diffraction and X-ray photoelectron spectroscopies were used to examine the effects of temperature on the structure of two...
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A crystal structure refinement of uralolite, Ca2Be4(PO4)3(OH)3∙5H2O, from Weinebene, Austria
The crystal structure of uralolite, Ca 2 Be 4 (PO 4 ) 3 (OH) 3 ·5H 2 O, from the spodumene deposit of Weinebene, Carinthia, Austria, has been refined with X-ray...
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On the homeotypes of kobellite
Kobellite is a Pb-Bi-Sb sulfosalt with minor amounts of (Cu, Fe) and with the crystal structure composed of two types of rods, one of which has...
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Crystal structures inherited from parent high-temperature disordered microblocks: Ca2SiO4, Na2SO4–K2SO4 sulfates, and related minerals (bubnovaite and dobrovolskyite)
Crystal structures of Ca 2 SiO 4 , Na 2 SO 4 –K 2 SO 4 sulfates, and related minerals bubnovaite K 2 Na 8 Ca(SO 4 ) 6 and dobrovolskyite Na 4 Ca(SO 4 ) 3 were described as...
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Three ammonium-iron-sulfite phases from a burning dump of the Vasas abandoned opencast coal mine (Pécs, Mecsek Mountains, Hungary) and the new mineral kollerite
Three ammonium-iron-sulfites (AIS) from a burning coal dump in an abandoned open coal pit at Pécs-Vasas (Mecsek Mountains, South Hungary) were...
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Crystal structure and investigation of Bi2TeO6·nH2O (0 ≤ n ≤ \({\raise0.5ex\hbox{$\scriptstyle 2$} \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{$\scriptstyle 3$}}\)): natural and synthetic montanite
The crystal structure of montanite has been determined using single-crystal X-ray diffraction on a synthetic sample, supported by powder X-ray...
