Open AccessJournal Article
Wood opal—A tridymite-like mineral
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This article is published in American Mineralogist.The article was published on 1973-08-01 and is currently open access. It has received 24 citations till now. The article focuses on the topics: Tridymite & Mineral.read more
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Opal, cristobalite, and tridymite: Noncrystallinity versus crystallinity, nomenclature of the silica minerals and bibliography
TL;DR: A classification and nomenclature for these forms is discussed in this article, where the authors provide an extensive bibliography of the literature on tridymite, cristobalite, and opal, as well as opal-C. The TEM evidence showing domains in the range 10-30 nm in a matrix of disordered opal suggest that the proper term for this system is paracrystalline analogous to inorganic and organic polymers.
Journal ArticleDOI
NMR, XRD and IR study on microcrystalline opals
TL;DR: In this article, microcrystalline opal CT and opal-C were investigated by 29Si MAS NMR and 29Si {1H} cross polarisation MAS NMRI spectroscopy, X-ray small angle scattering, Xray powder diffraction and infrared absorption spectrographic analysis.
Journal ArticleDOI
Petrifaction of wood by silica minerals
G. Scurfield,E.R. Segnit +1 more
TL;DR: In this article, the results indicate that petrifaction by silica involves penetration of wood via splits or checks, permeation of cell walls via a reticulated system of micropores, enlargement of the micropore system as cell wall components break down, and continuing deposition of silica at a rate and in a manner consistent with maintaining the dimensional stability of the wood.
Journal ArticleDOI
Alluvial and volcanic pathways to silicified plant stems (Upper Carboniferous-Triassic) and their taphonomic and palaeoenvironmental meaning
Petra Matysová,Ronny Rössler,Jens Götze,Jaromír Leichmann,Gordon Forbes,Edith L. Taylor,Jakub Sakala,Tomáš Matys Grygar +7 more
TL;DR: In this article, material signatures of silicified plant stems were obtained from X-ray diffraction analysis, hot cathodoluminescence (CL) imaging and spectroscopy.
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