Aperiodic mineral structures

Bindi, Luca; Chapuis, G.

doi:10.1180/emu-notes.19.1

Cited by 2 publications

(1 citation statement)

References 80 publications

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“…Gold and silver belong to the coinage metals group in the periodic table of the elements; they give extensive solid solutions in compounds, including minerals, and also form an alloy, known as electrum. Gold minerals often include heavy pnictogens and chalcogens (Sb, Bi, Se, Te); in particular, several gold and tellurium/antimony compounds are known, with a simple chemical formula, like calaverite and sylvanite, but their crystal structures are far from simple, showing incommensurate modulation under ambient conditions (Schutte & Boer, 1988;Pertlik, 1984;Reithmayer et al, 1993;Bindi et al, 2009;Bindi & Chapuis, 2017). Even the pure unsubstituted calaverite AuTe 2 shows a periodic ordered structure only under high-pressure conditions (Reithmayer et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and XANES investigation of petzite, Ag₃AuTe₂

Hongu

Yoshiasa

Nespolo

et al. 2019

Acta Crystallogr Sect B

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Petzite, Ag 3 AuTe 2 , crystallizes in the space group I4 1 32, which is a Sohncke type of space group where chiral crystal structures can occur. The structure refinement of petzite reported long ago [Frueh (1959). Am. Mineral. 44, 693-701] did not provide any information about the absolute structure. A new singlecrystal X-ray diffraction refinement has now been performed on a sample from Lake View Mine, Golden Mile, Kalgoorlie, Australia, which has resulted in a reliable absolute structure [a Flack parameter of 0.05 (3)], although this corresponds to the opposite enantiomorph reported previously. The minimum Te-Te distance is 3.767 (3) Å , slightly shorter than the van der Waals bonding distance, which suggests a weak interaction between the two chalcogens. XANES spectra near the Au and Te L III edges suggest that the chemicalbonding character of Au in petzite is more metallic than in other gold minerals.

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Section: Introductionmentioning

confidence: 99%

Crystal structure and XANES investigation of petzite, Ag₃AuTe₂

Hongu

Yoshiasa

Nespolo

et al. 2019

Acta Crystallogr Sect B

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Are quasicrystals really so rare in the Universe?

Bindi

Дмитриенко

Steinhardt

2020

American Mineralogist

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Until 2009, the only known quasicrystals were synthetic, formed in the laboratory under highly controlled conditions. Conceivably, the only quasicrystals in the Milky Way, perhaps even in the Universe, were the ones fabricated by humans, or so it seemed. Then came the report that a quasicrystal with icosahedral symmetry had been discovered inside a rock recovered from a remote stream in far eastern Russia, and later that the rock proved to be an extraterrestrial, a piece of a rare CV3 carbonaceous chondrite meteorite (known as Khatyrka) that formed 4.5 billion years ago in the pre-solar nebula. At present, the only known examples of natural quasicrystals are from the Khatyrka meteorite. Does that mean that quasicrystals must be extremely rare in the Universe? In this speculative essay, we present several reasons why the answer might be no. In fact, quasicrystals may prove to be among the most ubiquitous minerals found in the Universe.

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Aperiodic mineral structures

Cited by 2 publications

References 80 publications

Crystal structure and XANES investigation of petzite, Ag₃AuTe₂

Crystal structure and XANES investigation of petzite, Ag₃AuTe₂

Are quasicrystals really so rare in the Universe?

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Aperiodic mineral structures

Cited by 2 publications

References 80 publications

Crystal structure and XANES investigation of petzite, Ag3AuTe2

Crystal structure and XANES investigation of petzite, Ag3AuTe2

Are quasicrystals really so rare in the Universe?

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Crystal structure and XANES investigation of petzite, Ag₃AuTe₂

Crystal structure and XANES investigation of petzite, Ag₃AuTe₂