Micaceous

Mica schist deposits range in consistency from loosely consoHdated soil to fairly hard ore and vary in color from brown to almost white. These ore bodies are noted for thek micaceous appearance, which results from a 40—90% mica content. Mica sizes vary from <44 fim to - 1.5 cm. 

X-ray diffraction patterns yield typical 1.2—1.4 nm basal spacings for smectite partially hydrated in an ordinary laboratory atmosphere. Solvating smectite in ethylene glycol expands the spacing to 1.7 nm, and beating to 550°C collapses it to 1.0 nm. Certain micaceous clay minerals from which part of the metallic interlayer cations of the smectites has been stripped or degraded, and replaced by expand similarly. Treatment with strong solutions of... 

Glauconite. Glauconite [1317-57-3] (123—126) is a green, dioctahedral, micaceous clay rich in ferric iron and potassium. The generally accepted formula for glauconite is (Na,K)Q yg(Fe " oi o 45 o 65 35) io( )2 Glauconite has many characteristics common to iUite, but much... 

Celadonite [71606-04-7] is an iron-rich dioctahedral micaceous mineral that is similar to glauconite. Celadonite has a composition of (Na,K)Q... 

Vcrmiculitc. A micaceous mineral is roasted to cause exfoliation for use as an insulating material. 

A frequently cited example of protection from atmospheric corrosion is the Eiffel Tower. The narrow and, for that age, thin sections required a good priming of red lead for protection against corrosion. The top coat was linseed oil with white lead, and later coatings of ochre, iron oxide, and micaceous iron oxide were added. Since its constmction the coating has been renewed several times [29]. Modern atmospheric corrosion protection uses quick-drying nitrocellulose, synthetic resins, and reaction resins (two-component mixes). The chemist Leo Baekeland discovered the synthetic material named after him, Bakelite, in 1907. Three years later the first synthetic resin (phenol formaldehyde) proved itself in a protective paint. A new materials era had dawned. 

Most pigments can be used in any type of binder therefore, paints cannot be identified by pigment type alone. For example, micaceous iron oxide pigment is traditionally in an oil-based binder but is being increasingly used in epoxies, etc. In the paint coating film, the pigment content may vary from 15 to 60 per cent. In the special case of zinc rich primers, it is over 90 per cent. 

Modified pretreatment primer plus zinc chromate primer plus two coats of micaceous iron oxide/polyurethane. 

Pretreatment primer plus micaceous iron oxide/long oil tung phenolic. 

Pigments for finishes are selected on the basis of their colour, but special attention must be paid to inertness in the chosen binder and stability and light fastness under the conditions of application and exposure. Flake pigments such as aluminium and micaceous iron oxide give finishes of lower moisture-vapour permeability than conventional pigments, and consequently contribute to better protection. 

China clay waste, overburden sand, micaceous residue... 

Elemental bundance of intermediate rocks in China is average of dioritoids and andesitoids Elemental bundance of metapelite in the eastern part of China is average of slate, phylite and micaceous schist. 

Carbon tetrachloride slowly reacts with hydrogen sulfide in aqueous solution yielding carbon dioxide via the intermediate carbon disulfide. However, in the presence of two micaceous minerals (biotite and vermiculite) and amorphous silica, the rate transformation increases. At 25 °C and a hydrogen sulfide concentration of 0.001 M, the half-lives of carbon tetrachloride were calculated to be 2,600, 160, and 50 d for the silica, vermiculite, and biotite studies, respectively. In all three studies, the major transformation pathway is the formation of carbon disulfide. This compound is... 

Lee SY, Jackson ML, Brown JL (1975a) Micaceous occlusions in kaolinite observed by ultrami-cotomy and high resolution electron microscopy. Clays Clay Miner 23 125-129 Lee SY, Jackson ML, Brown JL (1975b) Micaceous vermicuUte, glauconite and mixed-layered kaolinite-montmorillonite by ultramicotomy and high resolution electron microscopy Proc Soil Sci Soc Amer 39 793-800... 

Table 5.59 Gibbs free energies of formation from the elements of micaceous components according to method of Tardy and Garrels (1974), compared with tabulated values. References as in table 5.57. Data in kJ/mole.

The Big Hole Brook Formation is the uppermost Formation in the Dalhousie Group and conformably overlies the Sunnyside Formation. The Big Hole Brook Formation consists of green-grey, micaceous, locally calcareous fine-grained thin- to thick-bedded sandstone and siltstone (Fig. 2). North of the deposit the Big Hole Brook Formation is unconformably overlain by clastic rocks of the Carboniferous Bonaventure Formation (Fig. 2). 

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