Kirk-Othmer Encyclopedia of Chemical Technology Vol 3 , by Raymond E Kirk; Donald F Othmer; Martin Grayson; David

By Raymond E Kirk; Donald F Othmer; Martin Grayson; David Eckroth; et al

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Extra info for Kirk-Othmer Encyclopedia of Chemical Technology Vol 3 , Edition: 4d ed

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However, they also vary chemically, having considerable halite and some thenardite with the glauberite at Zaragoza (the eastern and oldest area), and the glauberite being very pure with only a small amount of halite in the underlying clay at Rio Tiron-Belorado (the western and youngest < << <<< <<< <<< <<< k^< 'o o o i I eg O o PQ S> 1-H P «S b Spain 43 deposit). As with the Madrid Basin, the Ebro Basin is surrounded by mountains containing marine formations with some gypsum and clays, and both are near other closely related basins that do not contain glauberite (Orti, 1999).

Yeso. Glaub. ). Anhidrita. Glaub. ). Anhidrita. Glaub. ). Anhidrita. 11 Typical composition of glauberite at Rio Tiron. ) 44 Chapter 2 Ancient, Buried Deposits beds of variable thickness of these materials. The clay in the marl consists of predominantly kaolin and detritus of mica, quartz, and feldspar. In a few zones there are adjacent sandy beds made up of quartz-feldspar (in a ratio of —3:1) and a carbonate-gypsum binder in variable proportions. When the sulfate formation is near the surface, the anhydrite down to the water table has been converted to gypsum, and the soluble sulfates dissolved.

The Piedras Negra glauberite (under the thenardite) consisted of large anhedral crystals, sometimes interlayered or mixed with anhydrite, magnesite, and some quartz and mica. Orti et al. (1979) noted that most of the glauberite in the thenardite was in a massive microcrystalline form, and that there were some thin interlayers of hydroglauberite (5Na2S04*3CaS04-61120) consisting of small white fragile crystals. The glauberite contained many inclusions of quartz and magnesite, had "diffuse and sinuous contours," and "cloudy structures formed by small crystals of similar orientation" (Garcia del Cura et al, 1979).

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