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Sanidine

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sanidine [′san·ə‚dēn]
(mineralogy)
KAlSi3O8An alkali feldspar mineral occurring in clear, glassy crystals embedded in unaltered acid volcanic rocks; a high-temperature, disordered form. Also known as glassy feldspar; ice spar; rhyacolite.
Sanidine 

a rock-forming, monoclinic variety of feldspar; it is a solid solution of KAlSi3O8 and NaAlSi3O8, with the content of the potassium component ranging from 100 to 37 percent and a disordered distribution of Al and Si in the structure. At less than 37 percent KAlSi3O8, the structure becomes triclinic (high-temperature albite). In solid solution, sanidine contains up to 5–10 percent CaAl2Si2O8. Sanidine is one of the chief minerals of young extrusive and hypabyssal acid rocks (seeFELDSPAR).
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[FIGURE 2 OMITTED] In addition to the original material of this contribution, correlations based on the sanidine compositions from Kiipli & Kallaste (2002) and Kallaste & Kiipli (2006) were used for isopach schemes and study of the Rumba-Velise formations boundary.
Use of immobile trace elements for the correlation of Telychian ... by Kiipli, Tarmo; Orlova, Kiira; Kiipli, Enli; Kallaste, Toivo / Estonian Journal of Earth Sciences
Analysis proved the felspar to be sanidine, a disordered potash felspar.
From the ground up new work from an old landscape: Steve Harrison ... by Harrison, Steve / Ceramics Technical
The sanidine composition has been studied in twelve drill-cores with an aim to identify the ash beds in the Telychian of Estonia.
New correlations of Telychian (Silurian) bentonites in ... by Kallaste, Toivo; Kiipli, Tarmo / Proceedings of the Estonian Academy of Sciences: Geology
 
 
 
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