Feldspar Minerals: Volume 1 Crystal Structures, Physical, by Prof. Dr. Joseph V. Smith, Dr. William L. Brown (auth.)

By Prof. Dr. Joseph V. Smith, Dr. William L. Brown (auth.)

Remarks by way of JVS. Volumes 1 and a couple of of Feldspar Minerals have been released in 1974, yet quantity three used to be now not accomplished simply because i used to be compelled to commit three years to the answer of unexpected difficulties within the development of an ion probe. by means of 1977, the unfinished draft for quantity three had turn into out of date end result of the huge, immense advances in wisdom of feldspars, quite these in lunar rocks and meteorites, and in either deep-seated and old terrestrial rocks. moreover, it quickly grew to become noticeable thoroughly new edition of Feldspar Minerals was once wanted as a result vital new effects at the actual and chemical homes. I had stored up with the attention-grabbing yet tedious chore of weekly studying of the incoming literature and upkeep of the records. by way of 1980, the serious day-to­ day strain had long past from my learn courses on lunar rocks and at the improvement of the ion microprobe as a quantitative geochemical software, and that i begun coaching of a moment version of Feldspar Minerals.

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Additional resources for Feldspar Minerals: Volume 1 Crystal Structures, Physical, Chemical, and Microtextural Properties

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H 2 0 (Drits et al. 767 nm, f3 90°, P2 1 . Water molecules are disordered in the double sheets, and there is no evidence of AI,Si order. Long (1966) synthesized at high pressures from compositions KAIGe 3 0 S , KGaGe 3 0 S and KFeGe 3 0 S materials whose X-ray powder patterns indicated a common crystal structure. 699 nm. Such indexing of powder patterns in the absence of single crystal data is notoriously uncertain. 4 Pseudo-Orthorhomhic CaAI2 Si 2 0 s Takeuchi et al. 00(5)°. 6 2D net (Smith 1977).

The boundary between K-high albite and Na-sanidine is placed at rs, rather than arbitrarily at 40% Or, as in 1,12. The major composition fields are split arbitrarily by dashed lines. b Feldspars derived from some intermediate conditions of annealing such as might occur in small plutons. The solid areas show homogeneous feldspars while the hatched areas show ranges of composition for perthites, mesoperthites and antiperthites. c Feldspars SUbjected to prolonged annealing such as in some deep- seated plutonic and metamorphic rocks .

11), but quantitative interpretation for partly ordered structures is difficult. Electron Channeling Microanalysis. Small volumes can be analyzed from Xrays emitted in a transmission electron microscope. Electron channeling allows enhancement of X-ray emission from certain crystallographic sites. Taft0 and Buseck (1983) found 71 ± 3 at% Al in the T 1 site of Madagascar orthoclase. This technique should be useful for intergrowths. Macroscopic Physical Parameters. All the above techniques are too complex for routine work and some can be applied only to especially favorable crystals.

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