Chromium mica

The slope of line I is defined by only two samples one of which contained the rubidium-rich chromium mica fuchsite, the reliability of which as a geochronometer remains untested. Line II is defined by three typical metamorphic rocks of the Nimrod Group ... 

UG2 Morensky Reef Plant B recovery = 80-84% Ore PGM-dominated ores - with very little sulphides and the main gangue minerals include silicate, mica, aluminosilicate and some chromium... 

Antimony oxide White lead Lead sulfate Cadmium red Lead silicochromate Lead chromates Zinc chromates Cadmium yellow Calcium plumbate Chromium oxide Prussian blue Ultramarine blue Lead Barytes whiting China clay Mica Talc... 

In 1797, chromium received its name from a professor of chemistry and assaying at the School of Mines in Paris, Nicolas-Louis Vauquelin. He received some samples of crocoite ore and his subsequent analysis revealed a new metallic element, which he called chromium after the Greek word khroma, meaning color. After further research he detected trace elements of chromium in precious gems - giving the characteristic red color of rubies and the distinctive green of emeralds, serpentine, and chrome mica. 

Typical fillers wood flour, glass fiber, carbon fiber, mica, wollastonite, mineral wool, talc, magnesium hydroxide, graphite, molybdenum sulfide, carbon black, cashew shell particles, alumina, chromium oxide, brass and copper powder, iron particles, steel fiber, ceramic powder, rubber particles, aramid, wollastonite, cellulosic fiber, lignin... 

Chromphyllite and chromium-containing dioctahedral micas. A dioctahedral mica... 

Figure 11. Az (A) vs. the octahedral A1 content determined by microprobe analysis. The arrow indicates the dioctahedral chromium-rich mica (Evsyunin et al. 1997) which presents an unusual chemical composition characterized by an important "" Cr for A1 substitution. Symbols and samples as in Figure 3.

In order to produce ready-for-use zinc dust paint, zinc dust is slowly added to the binder in a ratio of 4-4.5 1 while stirring. Binder additives (e.g., antisettling agents such as bentonite, pyrogenic silica) and zinc dust additives (e.g., extenders such as mica, talc, kaolin, or colored components such as chromium(III) oxide, titanium dioxide) can be used to adjust the application behavior and properties of the paints. 

Clays and metal oxides and salts such as talc, kaolinite, mica, zinc oxide, titanium oxide, iron oxide, hydrated chromium oxide, cobalt blue, ultramarine blue, calcium carbonate, barium sulfate, etc. are widely used as pigments for cosmetics. Since these pigments possess acidic and basic surface properties, and hence catalytic activity, cos-... 

Iron and manganese occur in a number of soil minerals. Sodium and chlorine (as chloride) occur naturally in soil and are transported as atmospheric particulate matter from marine sprays (see Chapter 10). Some of the other micronutrients and trace elements are found in primary (unweathered) minerals that occur in soil. Boron is substituted isomorphically for Si in some micas and is present in tourmaline, a mineral with the formula NaMg3AlgB3Sig027(0H,F)4. Copper is isomorphically substituted for other elements in feldspars, amphiboles, olivines, p5Toxenes, and micas it also occurs as trace levels of copper sulfides in silicate minerals. Molybdenum occurs as molybdenite (M0S2). Vanadium is isomorphically substituted for Fe or A1 in oxides, pyroxenes, amphiboles, and micas. Zinc is present as the result of isomorphic substitution for Mg, Fe, and Mn in oxides, amphiboles, olivines, and pyroxenes and as trace zinc sulfide in silicates. Other trace elements that occur as specific minerals, sulfide inclusions, or by isomorphic substitution for other elements in minerals are chromium, cobalt, arsenic, selenium, nickel, lead, and cadmium. 

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