Ceramic Materials Database

Go to Oxides Materials Articles Glossary
CeramicMaterials.Info Database

FELDSPATHOID

Miscellaneous

• Family: None
• Region: None
• Mined At: Unspecified
• Raw Mineral: Yes
• Generic: No

Notes

(Richard Willis)

Any of a group of aluminosilicate minerals similar to the feldspars in chemical composition but differing with either having a lower silica to alkali ratio or containing chloride, sulfide, sulfate, or carbonate. The physical and chemical properties of the feldspathoids lie between those of the feldspar and zeolite groups. Feldspathoids are found chiefly in igneous and metamorphic rocks. They commonly occur in place of feldspars in alkali-rich, silica-poor rocks. The fusion temperature for any given feldspat hoid is significantly lower than its corresponding “true” feldspar, and thereby is usually preferred for under 1100ºC recipes calling for, say, a “soda feldspar” without any further qualification.
major feldspathoids
— analcime NaAlSi₂O₆ H₂O
— sodalite Na₄Al₃Si₃O₁₂ Cl
— cancrinite Na₆Ca₂Al₆Si₆O₂₄ (CO₃) 3H₂O
— leucite KAlSi₂O₆
— nepheline Na₃KAl₄Si₄O₁₆
— poliucite Cs₄Al₄Si₉O₂₆ H₂O
— scapolite (family)
—— marialite Na₄Al₃Si₉O₂₄ Cl
—— meionite Ca₄Al₆Si₆O₂₄ CO₃

Authors

• Richard Willis (Owner)

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="FELDSPATHOID" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Any of a group of aluminosilicate minerals similar to the feldspars in chemical composition but differing with either having a lower silica to alkali ratio or containing chloride, sulfide, sulfate, or carbonate. The physical and chemical properties of the feldspathoids lie between those of the feldspar and zeolite groups. Feldspathoids are found chiefly in igneous and metamorphic rocks. They commonly occur in place of feldspars in alkali-rich, silica-poor rocks. The fusion temperature for any given feldspat
hoid is significantly lower than its corresponding &amp;#147;true&amp;#148; feldspar, and thereby is usually preferred for under 1100&amp;ordm;C recipes calling for, say, a &amp;#147;soda feldspar&amp;#148; without any further qualification.&lt;BR&gt;
&lt;B&gt;major feldspathoids&lt;/B&gt;&lt;BR&gt;
&amp;#151; analcime NaAlSi&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt; H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;BR&gt;
&amp;#151; sodalite Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;12&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt; &lt;/SUB&gt;Cl&lt;BR&gt;
&amp;#151; cancrinite Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt;Ca&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt;Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;24&lt;/SUB&gt;&lt;/FONT&gt; (CO&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;) 3H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;BR&gt;
&amp;#151; leucite KAlSi&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt;&lt;BR&gt;
&amp;#151; nepheline Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;KAl&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;16&lt;/SUB&gt;&lt;/FONT&gt;&lt;BR&gt;
&amp;#151; poliucite Cs&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;9&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;26&lt;/SUB&gt;&lt;/FONT&gt; H&lt;FONT SIZE=2&gt;&lt;SUB&gt;2&lt;/SUB&gt;&lt;/FONT&gt;O&lt;BR&gt;
&amp;#151; scapolite (family)&lt;BR&gt;
&amp;#151;&amp;#151; &lt;SUB&gt; &lt;/SUB&gt;marialite Na&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;9&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;24&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt; &lt;/SUB&gt;Cl&lt;BR&gt;
&amp;#151;&amp;#151; meionite Ca&lt;FONT SIZE=2&gt;&lt;SUB&gt;4&lt;/SUB&gt;&lt;/FONT&gt;Al&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt;Si&lt;FONT SIZE=2&gt;&lt;SUB&gt;6&lt;/SUB&gt;&lt;/FONT&gt;O&lt;FONT SIZE=2&gt;&lt;SUB&gt;24&lt;/SUB&gt;&lt;/FONT&gt; CO&lt;FONT SIZE=2&gt;&lt;SUB&gt;3&lt;/SUB&gt;&lt;/FONT&gt;&lt;SUB&gt;&lt;BR&gt;
&lt;/SUB&gt;

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

---

Much more information with complete interlinking to many related databases can be found by logging into the www.ceramicmaterials.info database Copyright 2003 http://digitalfire.com, All Rights Reserved Please support http://ceramicmaterials.info to improve this library

INSIGHT is ceramic chemistry calculation software that runs on Windows, Mac and Linux and talks to this web site.