Partially sericitized tourmaline from a pegmatite was investigated using high-resolution transmission electron microscopy (HRTEM). Fine-grained muscovite crystals form extensive narrow veinlets preferentially developed along the {110} and {100} cleavages of tourmaline, indicating that a cleavage-controlled alteration mechanism was dominant. HRTEM images show that tourmaline-muscovite interfaces...

Abs t rac t -The reactivity of basal surfaces, steps and edges of muscovite was studied by imaging surface precipitates of PbC12 using atomic force microscopy (AFM). We reacted PbC12 solution with freshly cleaved muscovite surfaces and found that PbC12 precipitates were formed on the basal surfaces, steps and edges. It was observed that PbC12 precipitated preferentially along the steps compared...

The equil ibrium ratio of 3.93 for pSi(OH4~ p K +] was significantly different from the ratio of 3.40 predicted by the equation for the dissolution o f muscovite of this particular composit ion in the presence of gibbsite. A new dissolution equation was derived in which the muscovite composit ion was adjusted to satisfy the solute activity data, the presumption being that muscovite of a new com...

Studies have been made on muscovite single crystals treated under dry and hydrothermal conditions at temperatures above 800~ The course of reaction is markedly affected by the amount of water present in the system. In the presence of a large excess of water, appreciable reaction commences at 8(~0~ with the formation of kalsilite and corundum. The kalsilite may bear an epitaxial relationship to ...

Oxygen isotopes have been equilibrated between muscovite and aqueous alkali chloride solution and between paragonite and alkali chloride solution in the temperature range of 400ø-650øC at I and 1.5 kb fluid pressure. Isotopic equilibrium was inferred from the fact that compatible fractionation factors were obtained using 3 different chemical reactions to produce the mica: (1) muscovite or parag...

The adsorption of dodecylamine acetate (DAA), sodium oleate (NaOL) and DAA–NaOL mixtures on muscovite mica were investigated through flotation tests, zeta potential measurements, and pyrene fluorescence tests. The results show that the muscovite mica has a negative charge over the pH range 2–12. The muscovite mica did not float in the presence of NaOL alone. However, the recovery of muscovite m...

Vanadium-bearing muscovite is the most valuable component of stone coal, which is a unique source of vanadium manufacture in China. Numbers of experimental studies have been carried out to destroy the carrier muscovite’s structure for efficient extraction of vanadium. Hence, the vanadium location is necessary for exploring the essence of vanadium extraction. Although most infer that vanadium ma...

The high-silica sericites generally contain a corresponding appreciable quantity of a divalent element, usually magnesium, and their chemical composition is interpreted as being intermediate between that of muscovite, KA12 (A1Sia)O10(OH)2, and that of the equivalent high-silica mica leucophyllite, KAIMg (Si4)O10(0H)2. The series muscovite-leucophyl]ite includes the named micas phengite (high-si...

The mixed cationic collector cetyltrimethylammonium chloride (CTAC) and nonionic collector octanol (OCT) was found to exhibit a synergistic effect on the flotation and adsorption of muscovite. To understand the underlying synergistic mechanism, flotation, contact angle, surface tension, and adsorption measurements were carried out. The results obtained from flotation measurements indicated that...

Muscovite granite (13.8% muscovite, 4.8% normafive corundum) was reacted, with varying percentages of H20, in cold-seal vessels at 2 kbar and in piston-cylinder apparatus between 10 and 35 kbar. The diagrams illustrating melting/crystallization relationships are: P-T sections with both excess H20 and with no H:O added (0.66% H20 in rock); T-X•2o sections at 15 kbar and 25 kbar showing H:O-under...