introduction: boron is one of the eight essential micronutrients required for plant growth and development. the optimal concentration range (between deficiency and phytotoxicity) for boron is narrower than for other plant essential nutrients. generally, irrigating water containing concentrations of b greater than 1 mg l-1 would be detrimental for most plants. although, there are a large number ...

Paragonite has been found in two chloritoid-chlorite-mica schists from the Dalradian, north of Stonehaven. The principal bulk-chemical constraints on the occurrence of this mineral within the chloritoid zone appear to be the ratios of soda to potash and the A1203 contents of the rock. The composition of paragonite coexisting with muscovite indicates a crystallization temperature of 550 ~ for ro...

This research used atomic force microscopy (AFM) to gain a better understanding of the interactions between muscovite mica and a model colloid used commonly throughout the existing colloid transport literature. The interaction forces between a single crystal muscovite mica disc and a 2.0-μm carboxyl-modified polystyrene latex microsphere attached to a tipless silicon nitride (SiN) cantilever we...

A comparison was made between single-crystal structure refinements, electron microprobe analyses and octahedral site populations of seven biotite crystals and data obtained previously for coexisting muscovite in peraluminous granites using the same methods. Both micas, from several plutons of Northern Victoria Land (Antarctica) and Sardinia (Italy), show significant octahedral substitutions: bi...

The pegmatitic rocks located in the south-east of Côte d'Ivoire between Comoé basin and Sefwi belt are subject this study. geology region consists gneisses, granites, microgranites, amphibolites, mylonites metasediments. All these generally crosscut by quartz pegmatite lodes. petrographic studies allow us to discriminate four groups pegmatites on basis mineralogy: (i) beryl-muscovite bearing (A...

S U M M A R Y. Single-crystal diffraction patterns produced by transmitted radiation, both X-rays and electrons, reveal varying degrees of disorder and long-range order in common phyllosilicates from several different rock types. The transmission electron micrographs and their selected-area diffraction patterns demonstrate the presence of numerous stacking faults parallel to (ool) of muscovite ...

Microtextural and experimental studies have yielded conflicting data on the relative mechanical strengths of muscovite and biotite [Wilson and Bell, 1979; Kronenberg et al., 1990; Mares and Kronenberg, 1993]. We propose a crystal-chemical resolution to this conflict, namely, that (001) dislocation glide in biotite is rate-limited by its fluorine content. Significant F(OH)_• substitution, and co...

Delamination of muscovite induced by metal cations is a promising way to fine-tune properties of this mica material. For studies of delamination, the ITC-WGT institute has developed a method to intercalate polyvalent metal ions, like Cu, Mg, Zn or Al into muscovite. This paper refers to X-ray fluorescence analysis (XRF) of these samples at ANKA synchrotron radiation facility, Karlsruhe, Germany...