The crystal structures of two oligoclases : A comparison with low and high albite

Phillipsi, M. W.; Colville, A. A.; Ribbe, P. Η.

doi:10.1524/zkri.1971.133.16.43

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…Rietveld refinement requires information on crystal structures of phases in the sample. We used amcsd 0010721 (Phillips and Colville, 1971) for plagioclase (An16, oligoclase structure), amcsd 0007928 (Tseng et al., 1995) for K‐feldspar (orthoclase), amcsd 0001298 (Brigatti & Davoli, 1990) for 1M biotite and amcsd 0006212 (Antao et al., 2008) for quartz. The trigonal quartz structure has been changed to the left‐handed space group P3 1 21.…”

Section: Measurementsmentioning

confidence: 99%

Intrinsic Elastic Anisotropy of Westerly Granite Observed by Ultrasound Measurements, Microstructural Investigations, and Neutron Diffraction

et al. 2021

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Granitic rocks attract attention because of their elastic and mechanical properties. A large number of dedicated experimental studies has been initiated due to relevance of granites to development of nuclear waste storage, geothermal projects, rock mechanics, and earthquake mechanics. Quantification of elastic properties of granites is important to determine crustal seismic velocities and stress orientation. Generally, it is assumed that granitic rocks are elastically isotropic. To determine whether rock material is isotropic or anisotropic ultrasonic methods can be applied (Babuška, 1968; Bajuk et al., 1967; Barruol and Kern. 1996; Kern & Wenk, 1990). Multidirectional (up to 132 independent directions) experiments are necessary in case of lower symmetry, unknown orientation of anisotropy or simply to diminish the effect of rock heterogeneity (e.g.,

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Section: Measurementsmentioning

confidence: 99%

Intrinsic Elastic Anisotropy of Westerly Granite Observed by Ultrasound Measurements, Microstructural Investigations, and Neutron Diffraction

et al. 2021

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“…Members of the feldspar mineral family consist of silica tetrahedra with varying degrees of Al-Si substitution, which results in surface charges and the presence of counterions within the crystal lattice (Papike and Cameron, 1976). While the counterion found in orthoclase is typically K + , those associated with the members of the plagioclase family are Na + and Ca 2+ (Colville and Ribbe, 1968;Fitz Gerald et al, 1986;Phillips et al, 1971;Wenk et al, 1980).…”

Section: Feldspar Mineralsmentioning

confidence: 99%

Feldspar minerals as efficient deposition ice nuclei

Yakobi-Hancock¹,

Ladino²,

Abbatt³

2013

Preprint

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Mineral dusts are well known to be efficient ice nuclei, where the source of this efficiency has typically been attributed to the presence of clay minerals such as illite and kaolinite. However, the ice nucleating abilities of the more minor mineralogical components have not been as extensively examined. As a result, the deposition ice nucleation abilities of 24 atmospherically-relevant mineral samples have been studied, using a continuous flow diffusion chamber at −40.0 ± 0.3 °C. The same particle size (200 nm) and particle preparation procedure were used throughout. The ice nucleation behaviour of the pure minerals is compared to that of complex mixtures, such as Arizona Test Dust (ATD) and Mojave Desert Dust (MDD), and to lead iodide, which has been previously proposed for cloud seeding. Lead iodide was the most efficient ice nucleus (IN), requiring a critical relative humidity with respect to ice (RH_i) of 122.0 ± 2.0% to activate 0.1% of the particles. MDD (RH_i 126.3 ± 3.4%) and ATD (RH_i 129.5 ± 5.1%) have lower but comparable activity. From a set of clay minerals (kaolinite, illite, montmorillonite), non-clay minerals (e.g. hematite, magnetite, calcite, cerussite, quartz), and feldspar minerals (orthoclase, plagioclase) present in the atmospheric dusts it was found that the feldspar minerals (particularly orthoclase), and not the clays, were the most efficient ice nuclei. Orthoclase and plagioclase were found to have critical RH_i values of 127.1 ± 6.3% and 136.2 ± 1.3%, respectively. The presence of feldspars (specifically orthoclase) may play a significant role in the IN behaviour of mineral dusts despite their lower percentage in composition relative to clay minerals

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“…9) collected from the mineral andesine [(Ca,Na)(Al,Si)4O8] [38]. This case is very similar to anorthite, i.e., the reported triclinic unit cells in literatures (as summarized in Table S4, [35,[39][40][41][42][43]) are actually not a primitive triclinic Bravais unit cell. The direct determination result by our method is: a0 = 7.143 Å, b0 = 7.534 Å, c0 = 7.577 Å, α0 = 114.68°, β0 = 101.94°, γ0 = 105.08°, with a unit-cell volume 333.82 Å 3 .…”

Section: Resultsmentioning

confidence: 57%