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sanidine

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san·i·dine  (sn-dn, -dn)
n.
A glassy variety of orthoclase feldspar, known as moonstone when translucent.

[Greek sanis, sanid-, board (from its flat crystals) + -ine.]

sanidine [ˈsænɪˌdiːn -dɪn]
n
(Earth Sciences / Minerals) an alkali feldspar that is a high-temperature glassy form of orthoclase in flat, tabular crystals, found in lavas and dykes. Formula: KAlSi3O8
[from German, from Greek sanis, sanidos a board]


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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.
Analysis proved the felspar to be sanidine, a disordered potash felspar.
The sanidine composition has been studied in twelve drill-cores with an aim to identify the ash beds in the Telychian of Estonia.
 
 
 
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