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B QUARTZ [1 record]
Record 1 - internal organization data 1998-09-22
Record 1, English
Record 1, Subject field(s)
- Petrography
- Mineralogy
Record 1, Main entry term, English
- beta quartz
1, record 1, English, beta%20quartz
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- B-quartz 2, record 1, English, B%2Dquartz
correct
- B quartz 3, record 1, English, B%20quartz
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
The polymorph of quartz that is stable from 573°C to 870°C, that has a vertical axis of six-fold symmetry and six horizontal axis of two-fold symmetry, and that has a lower refractive index and birefringence than those of alpha quartz. 4, record 1, English, - beta%20quartz
Record number: 1, Textual support number: 1 CONT
Some natural substances exist in various mineral forms (polymorphs) and some use of their inversion temperatures can be made in geothermometry. For example, B-quartz inverts to [alpha]-quartz with falling temperature at 573°C. We can determine wether quartz originally crystallized as B-quartz by etching with hydrofluoric acid, and thus decide whether it was deposited above or below 573°C. 5, record 1, English, - beta%20quartz
Record 1, French
Record 1, Domaine(s)
- Pétrographie
- Minéralogie
Record 1, Main entry term, French
- quartz bêta
1, record 1, French, quartz%20b%C3%AAta
correct, masculine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
- quartz B 2, record 1, French, quartz%20B
correct, masculine noun
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Déséquilibre thermodynamique des zones liminaires. - [...] Un tel déséquilibre affecte [...] le quartz alpha vers 573 °C, au moment où il se transforme en quartz bêta [...]. À ce moment le quartz présente une sensibilité chimique exceptionnelle et se combine facilement avec des oxydes métalliques alors qu'il ne peut le faire ni avant ni après. 1, record 1, French, - quartz%20b%C3%AAta
Record number: 1, Textual support number: 2 CONT
[...] à 573 °C, le quartz alpha rhomboédrique se transforme en quartz ß. Ce passage s'accompagne d'un état de désordre du réseau cristallin [...] 3, record 1, French, - quartz%20b%C3%AAta
Record number: 1, Textual support number: 3 CONT
Les inversions de la silice sont classiques, en particulier celle du quartz [alpha] en quartz B à 575°. À la température ordinaire le quartz est toujours [alpha] (pseudo-hexagonal, rhomboédrique énantiomorphe). Le quartz B (hexagonal, hémiedrie énantiomorphe) inversé en quartz [alpha] par refroidissement peut être reconnu à certains caractères, par exemple à un maclage irrégulier et à une fracturation très poussée [...] 4, record 1, French, - quartz%20b%C3%AAta
Record number: 1, Textual support number: 4 CONT
Quartz haute température (quartz ß). 5, record 1, French, - quartz%20b%C3%AAta
Record 1, Spanish
Record 1, Textual support, Spanish
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