SANIDINE

Miscellaneous

Notes

(Richard Willis)

An alkali feldspar mineral, characterized by its high-temperature form of potassium aluminosilicate (KAlSi308) — its structure is stable only above 700ºC. Sanidine forms colorless or white, glassy, transparent crystals in acidic volcanic rocks.
The name 'anorthoclase' is applied to the intermediate members of the high-albite-sanidine series that contain less than 40 percent KAlSi3O8. Anorthoclase occurs, often as crystals, only in sodium rich volcanic rocks, such as in andesitic lavas.

Authors

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="SANIDINE" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>An alkali feldspar mineral, characterized by its high-temperature form of potassium aluminosilicate (KAlSi&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;0&lt;FONT SIZE=2&gt;&lt;SUB&gt;8&lt;/SUB&gt;&lt;/FONT&gt;) &amp;#151; its structure is stable only above 700&amp;ordm;C. Sanidine forms colorless or white, glassy, transparent crystals in acidic volcanic rocks.&lt;BR&gt;
The name \'anorthoclase\' is applied to the intermediate members of the high-albite-sanidine series that contain less than 40 percent KAlSi&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;8&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt;.&lt;/SUB&gt; Anorthoclase occurs, often as crystals, only in sodium rich volcanic rocks, such as in andesitic lavas.&lt;BR&gt;

</note>
</notes>
</material>


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