OLIGOCLASE

Miscellaneous

Notes

(Richard Willis)

Mineral, of the plagioclase group (Ab80An20) of the ideal form Na2O, CaO, Al2O3, SiO2 with a typical empirical analysis of Na2O 9.5%, CaO 4.0%, Al2O3 22.5%, SiO2 68.7%
Hardness 6-6.5 Density 2.64 Acid insoluble
A preferred aluminosilicate “soda-cal” feldspar when a strong sodium to calcium ratio (4:1) is desired.

Authors

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="OLIGOCLASE" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Mineral, of the plagioclase group (Ab&lt;FONT SIZE=2&gt;&lt;SUB&gt;80&lt;/SUB&gt;&lt;/FONT&gt;An&lt;FONT SIZE=2&gt;&lt;SUB&gt;20&lt;/SUB&gt;&lt;/FONT&gt;) of the ideal form Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O, CaO, Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt; with a typical empirical analysis of Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 9.5%, CaO 4.0%, Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt; 22.5%, SiO&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt; 68.7%&lt;BR&gt;
Hardness 6-6.5 Density 2.64 Acid insoluble&lt;BR&gt;
A preferred aluminosilicate &amp;#147;soda-cal&amp;#148; feldspar when a strong sodium to calcium ratio (4:1) is desired.&lt;BR&gt;

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


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