ERTHYRITE

Miscellaneous

Notes

(Richard Willis)

Mineral, of the ideal form Co3(AsO4)2, 8H2O with a typical analysis of CoO 37.54%, As2O5 38.39%, H2O 24.07%
Hardness: 2 Density: 3.07 Soluble in NO3H Melts to a pearl grey or blue
A common cobalt-bearing mineral, and convenient way of introducing arsenic to formulas, used since antiquity to give blue hues in, particularly, alkaline glazes, especially those very rich in sodium.

Authors

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="ERTHYRITE" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Mineral, of the ideal form Co&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;(AsO&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;)&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;, 8H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O with a typical analysis of CoO 37.54%, As&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;5&lt;/SUB&gt;&lt;/FONT&gt; 38.39%, H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O 24.07%&lt;BR&gt;
Hardness: 2 Density: 3.07 Soluble in NO&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;H Melts to a pearl grey or blue&lt;BR&gt;
A common cobalt-bearing mineral, and convenient way of introducing arsenic to formulas, used since antiquity to give blue hues in, particularly, alkaline glazes, especially those very rich in sodium.&lt;BR&gt;

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


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