TUFA

Miscellaneous

Notes

(Richard Willis)

Sedimentary rock, calcareous deposits lain by long or short-term water flows (springs, falls, fissure seapages, etc.) having characteristics of their geophysical origin: sedimentary, phylonic, volcanic, etc. see calcareous tufa, travertine, and volcanic tuff
Glazes made out of or intended to resemble calcareous tufa or volcanic tuff. Normally, the tufa are 1000-1150ºC glazes, while the tuff are over 1150ºC. Either can be milled as used as a frit to formulate a glaze or as is for a complete glaze. When used as complete glazes firing temperatures vary according to degrees of desired opacity, so it is usually a matter of discovering at what temperature a sample will begin to melt and carrying on from there.

Authors

XML

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<material name="TUFA" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Sedimentary rock, calcareous deposits lain by long or short-term water flows (springs, falls, fissure seapages, etc.) having characteristics of their geophysical origin: sedimentary, phylonic, volcanic, etc. &lt;FONT SIZE=2&gt;see &lt;B&gt;&lt;I&gt;calcareous tufa&lt;/I&gt;&lt;/B&gt;, &lt;B&gt;&lt;I&gt;travertine, &lt;/I&gt;&lt;/B&gt;and &lt;B&gt;&lt;I&gt;volcanic tuff&lt;/I&gt;&lt;/B&gt;&lt;/FONT&gt;&lt;BR&gt;
Glazes made out of or intended to resemble calcareous tufa or volcanic tuff. Normally, the tufa are 1000-1150&amp;ordm;C glazes, while the tuff are over 1150&amp;ordm;C. Either can be milled as used as a frit to formulate a glaze or as is for a complete glaze. When used as complete glazes firing temperatures vary according to degrees of desired opacity, so it is usually a matter of discovering at what temperature a sample will begin to melt and carrying on from there.&lt;BR&gt;

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


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