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PLASTER OF PARIS

Miscellaneous

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

Notes

(Richard Willis)

Mineral, of the gypsum (calcium sulfate) variety, the name derived from “gypsum of Paris” and thus has the basic properties of the mineral gypsum. It is popularly used for casting molds and cast figures, and rarely used in clay or glaze compositions unless previously calcinated to rid it of its sulfuric-acid potential. As a casting plaster, though a wetted mix will harden upon drying, it is usual to make a mixture of gypsum and the more active lime in order to come up with a paste that will set up rapidly.

Authors

• Richard Willis (Owner)

XML

<?xml version="1.0" encoding="UTF-8"?>
<material name="PLASTER OF PARIS" descrip="" generic="0" rawmineral="1" searchkey="" loi="0.00">
<notes>
<note>Mineral, of the gypsum (calcium sulfate) variety, the name derived from &amp;#147;gypsum of Paris&amp;#148; and thus has the basic properties of the mineral gypsum. It is popularly used for casting molds and cast figures, and rarely used in clay or glaze compositions unless previously calcinated to rid it of its sulfuric-acid potential. As a casting plaster, though a wetted mix will harden upon drying, it is usual to make a mixture of gypsum and the more active lime in order to come up with a paste that will set up
rapidly.&lt;BR&gt;

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

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