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Magnesite

Formula: MgCO3
Alternate Names: Mag Carb, MgCO3

OxideAnalysisFormula
MgO47.80%1.000
CO252.20
Oxide Weight40.30
Formula Weight84.31
If this formula is not unified correctly please contact us.
DENS - Density (Specific Gravity) 3
HMOH - Hardness (Moh) 4-4.5
SLBY - Solubility Soluble in warm acids

Magnesite is used in pottery bodies, glazes, and glass. Magnesite is used in low fire glazes to produce opacity and matteness.

In glaze melts it is an active flux at higher temperatures (2150C+), and it produces elasticity, a lower expansion coefficient and smooth buttery surfaces. At lower temperatures it is a refractory and will matte glazes and make them crawl due to its high shrinkage and contributions to the surface tension of the melt.

This material has a very high Loss on Ignition, this could cause glaze surface issues. Dolomite and talc more readily release their MgO to the glaze melt for a higher temperature glazes.

Magnesium carbonate by itself is very refractory, and is used to make bricks for the cement and metal industries. It is 'dead burned' in rotary kilns, then reground, sized, and dry pressed using organic binders.

This material has a much higher weight density than light magnesium carbonate, the latter is an incredibly fluffy and light white powder.


Mechanisms

Out Bound Links

In Bound Links


By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Magnesite" descrip="" searchkey="Mag Carb, MgCO3" loi="0.00" casnumber="7757-69-9"> <oxides> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="47.800" tolerance=""/> </oxides> <volatiles> <volatile symbol="CO2" name="Carbon Dioxide" percent="52.200" tolerance=""/> </volatiles> </material>


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