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Quartz

About: Quartz is a research topic. Over the lifetime, 12367 publications have been published within this topic receiving 198879 citations. The topic is also known as: SiO2 & α-aQuarz.


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Book ChapterDOI
01 Jan 1995
TL;DR: In this paper, the topology of the tetrahedral linkage and the efficiency of space filling are compared for the various polymorphs of SiO2, and the displacive transformations from a more open high-temperature form (e.g., "high" or "h") to a denser form stable at lower temperatures (α quartz or cristobalite) are discussed.
Abstract: With very few exceptions the numerous polymorphs of SiO2 all consist of SiO4 tetrahedra linked through their corners, thus forming three-dimensional framework structures. The topology of the tetrahedral linkage and the efficiency of space filling are different for the polymorphs. For a given type of framework, for example, that of quartz or cristobalite, space filling can be improved by so-called displacive transformations from a more open high-temperature form (e.g., “high”, “h”, or β “quartz”) to a denser form stable at lower temperatures (“low” or “α quartz”). These transformations do not change the topology of the framework, i.e., chemical bonds in a crystal can be deformed, but are not broken and rearranged.

2,101 citations

Journal ArticleDOI
TL;DR: In this paper, the proportions of Ca, Na and K released by feldspars of plutonic rocks (granites to gabbros) to weathering solutions were predicted.

1,805 citations

Journal ArticleDOI
TL;DR: In this article, the authors measured the equilibrium constants for oxygen isotope exchange between quartz and water and showed that the behavior of fractionation with temperature can be approximated by 1000 ln α = 3.38 (106 T−2) − 3.40 for 200°-500°C and by 2.51 (1.96) − 1.96 for 500°-750°C.
Abstract: Equilibrium constants for oxygen isotope exchange between quartz and water have been measured from 195°C (1000 ln α = 12.0) to 750°C (1000 ln α = 0.4). Over limited temperature ranges the behavior of fractionation with temperature can be approximated by 1000 ln α = 3.38 (106 T−2) − 3.40 for 200°–500°C and by 1000 ln α = 2.51 (106 T−2) − 1.96 for 500°–750°C. The results of measurements in the quartz-water system can be combined with analogous results from other mineral systems to make mineral-pair isotopic thermometers for application to problems of petrogenesis.

1,309 citations

Journal ArticleDOI
K. Keiji Kanazawa1, Joseph G. Gordon1
TL;DR: In this article, a simple relationship was derived which expressed the change in oscillation frequency of a quartz crystal in contact with a fluid in terms of material parameters of the fluid and the quartz.

1,222 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023790
20221,643
2021293
2020347
2019410
2018424