sodalite


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sodalite

[′sōd·əl‚īt]
(mineralogy)
Na2 Al3Si3O12Cl A blue or sometimes white, gray, or green mineral tectosilicate of the feldspathoid group, crystallizing in the isometric system, with vitreous luster, hardness of 5 on Mohs scale, and specific gravity of 2.2-2.4; used as an ornamental stone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
There can also be some difficulty in extracting all the exchangeable [Na.sup.+], and Wong and Ho (1995) showed divalent cations were ineffective at extracting exchangeable Na held in the structure of the sodalite and/or cancrinite present in bauxite residue.
I searched for a name of a rock formation and discovered that low-silica igneous rocks may have large masses of sodalite, a mineral which has a rich blue color, ranging from clear to violet.
However, synthesis of sodalite is corresponding to about 86.0% of [K.sup.+] extracted, and 92.6% of [K.sup.+] was recovered from the solution after analcime synthesis.
2) is coarse-grained and rich in K-feldspar and albite (combined about 70%); it contains conspicuous yellow granular-textured cancrinite, greasy-grey coarsegrained nepheline, and less common fine-grained blue sodalite. Accessory minerals include coarse-grained biotite that is typically segregated into streaks within the lighter colored minerals, and euhedral zircon prisms up to 5 mm in length.
These rocks contain mineral 'nepheline' as their major component along with other feldspathoidal minerals, like, cancrinite and sodalite [1, 12, 13, 17].
At the centre of the marble floor in the ROM's 1933 Rotunda a variegated star, cut from sodalite, lies within successively larger starburst patterns.
Singh B, Gilkes RJ (1991a) Concentration of iron oxides from soil clays by 5 M NaOH treatment: the complete removal of sodalite and kaolin.
At the Main Show, French dealer Francois Lietard (francois.lietard@wanadoo.fr) and Colorado dealer Dudley Blauwet (mtnmin @attglobal.et) had between them about 30 specimens showing the new, highly lustrous, madly bright blue crystals of sodalite from a find somewhere in the Kokcha Valley, Badakhshan, Afghanistan.
Within two blocks of this intersection we can see a beautiful polished slab of sodalite with blebs of magnetite that can stop a speeding magnet (Fig.
Iita said the contribution from dimension stones such as granite, marble and sodalite, as well as semi-precious stones, is not very significant and is expected to remain unchanged in the short- to medium-term.