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Calcium Sulphate

Anhydrous Gypsum, Anhydrite

Chemistry CaO 41.200

Volatiles LOI 58.800

Miscellaneous

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

Notes

This material is found as a salt in deposits in Germany and can be manufactured from gypsum. Anhydrous gypsum is soluble in water and used as a floculant to prevent settling in glaze slurries.

Calcium sulphate is often found in raw clay deposits as a partially soluble impurity which causes efflorescence. During drying the salts are left behind of the surface of the clay to discolor it after firing. Barium carbonate is often used to precipitate this material (see barium).

Data

• Melting Point (MP): 1450C
• Specific Gravity: 2.8-2.9
• Hardness (Moh): 3-3.5
• Hardness (Moh): 3-3.5
• Specific Gravity: 2.8-2.9
• Melting Point (MP): 1450C

Suppliers

• Generic
  

Authors

• Tony Hansen (Owner)

XML

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<material name="Calcium Sulphate" descrip="Anhydrous Gypsum, Anhydrite" generic="0" rawmineral="0" searchkey="" loi="58.80">
<families>
<family name="Other"/>
</families>
<oxides>
<oxide symbol="CaO" name="Calcium Oxide, Calcia" status="U" percent="41.200" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="" name="" percent="58.800" tolerance=""/>
</volatiles>
<suppliers>
<supplier name="Generic" country="" url="" label=""/>
</suppliers>
<notes>
<note>This material is found as a salt in deposits in Germany and can be manufactured from gypsum. Anhydrous gypsum is soluble in water and used as a floculant to prevent settling in glaze slurries.

Calcium sulphate is often found in raw clay deposits as a partially soluble impurity which causes efflorescence. During drying the salts are left behind of the surface of the clay to discolor it after firing. Barium carbonate is often used to precipitate this material (see barium).</note>
</notes>
<testdata>
<testitem testname="0" value="1450C"/>
<testitem testname="0" value="2.8-2.9"/>
<testitem testname="0" value="3-3.5"/>
<testitem testname="0" value="3-3.5"/>
<testitem testname="0" value="2.8-2.9"/>
<testitem testname="0" value="1450C"/>
</testdata>
</material>

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