Results 51 to 60 of about 98 (95)
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Metamict and chemically altered vesuvianite
The Canadian Mineralogist, 1993Partly metamict vesuvianite samples from two localities were examined and compared. The unit cell of one is enlarged owing to volume expansion caused by the buildup of radiation damage. The other sample sustained enough damage to exclude accurate determination of unit-cell parameters.
R. K. Eby +7 more
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High Temperature Study of Metamict Steenstrupine
Solid State Phenomena, 2010Metamict minerals contain radioactive elements that degrade their crystal structure. Unlike other metamict minerals, annealing process under ambient pressure do not lead to direct recrystallization of steenstrupine.
Joachim Kusz +4 more
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High Temperature Study of Metamict Rinkite
Solid State Phenomena, 2013Metamict minerals contain radioactive elements that degrade their crystal structure. During the annealing process under ambient pressure in argon atmosphere the sample of metamict rinkite recrystallizes to the primary crystalline form at 700°C. Further heating leads to the formation of a new crystalline phase.
Maciej Zubko +4 more
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Is "metamictization" of zircon a phase transition?
American Mineralogist, 1999Diffuse X-ray scattering from single crystals of metamict zircon reveals residual crystallinity even at high fluences (up to 7.2 × 10 18 α-decay events/g). The experimental evidence does not suggest that radiation-induced amorphization is a “phase transition.” The observations are in good agreement with a nonconvergent, heterogeneous model of ...
E. K. H. Salje, J. Chrosch, R. C. Ewing
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DEHYDRATION OF METAMICT TITANITE: AN INFRARED SPECTROSCOPIC STUDY
The Canadian Mineralogist, 2000We carried out a study of dehydration in natural metamict and crystalline samples of titanite between 20 and 1060 K. Infrared absorption spectra of crystalline titanite show at least five O–H stretching bands in the region between 2000 and 4500 cm −1 . Metamict samples show a broad distribution of stretching modes between 2500 and 3700 cm −1 .
Zhang, M. +4 more
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A second occurrence of non-metamict davidite
Mineralium Deposita, 1968A second occurrence of non-metamict davidite has been found in the Kirumba syenitic massif, Kivu, Rep. of Congo (Kinshasa). Its properties are described. Its geochemical data support the hypothesis of a genetic relationship between the Kirumba massif and the alkaline complex with carbonatites of Lueshe.
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The metamict state: 1993 — the centennial
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1994Abstract In 1893, a Norwegian mineralogist, W.C. Brogger, defined “metamikte” as a third class of naturally occurring, amorphous materials. Metamict minerals were determined to be amorphous based on conchoidal fracture and isotropic optical properties; however, well developed crystal forms evidenced the prior crystalline state. In 1914, A.
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Understanding the effect of metamictization on the efficiency of zircon milling
Minerals Engineering, 2023Stuart Blackburn +2 more
exaly
Structure and composition of metamict coffinite (concerning the nature of metamict minerals)
International Geology Review, 1980B. V. Brodin +2 more
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