Light Magnesium Carbonate
Formula: Mg5(CO3)4(OH)2.4H2O
A white very light-weight powder (and bag of this material is like a bag of feathers). It is practically insoluble in water. Light magnesium carbonate or hydromagnesite is made by precipitation from a boiled solution of magnesium sulfate and sodium carbonate.
This material is very refractory, it does not decompose and give up its MgO to the glaze melt easily. Magnesium carbonate is a good example of the need to consider mineralogy and material level physics in addition to chemical makeup when using ceramic chemistry to adjust and fix glazes. Two glazes may have the same calculated chemistry, but the one using the mag carg to source the MgO will not be melted as much.
When added to glazes magnesium carbonate often mattes them, simply because it is refractory (it is useful at lower temperatures where making a good matte can be quite difficult). Magnesium carbonate can also induce crawling because of the decreased mobility of the glaze melt and the exceedingly small particle size of the material.
It is added (.12-.25%) to flocculate clay slurries, improving and stabilizing the set and suspension characteristics.
It is used as a electrolyte in both ground and cover coat enamels.
pH (1% suspension): 9.5
Bulk Density: 130-140 g/l
Particle Size (+6 microns): 75% (+2 microns): 98%
Out Bound Links
- (Typecodes)
1: GNM - Generic Material
- (Typecodes)
1: FLS - Flux Source
- (URLs)
Hydrated Magesium Carbonate at Wikipedia
http://en.wikipedia.org/wiki/Hydromagnesite - (URLs)
Hydromagnesite at webmineral.com
http://webmineral.com/data/Hydromagnesite.shtml - (MDT - Member)
North America
The decision about what materials to include in th... - (MDT - Member)
New Zealand
We are working on this database and would apprecia... - (MDT - Member)
Latin and South America
Latin America and South America. We are working on... - (MDT - Member)
UK
We are working on this database and would apprecia... - (MDT - Member)
Europe
Countries of Eastern Europe and former Soviet Unio... - (MDT - Member)
Australia
We are working on this database and would apprecia... - (MDT - Member)
Asia
All of Asia including Turkey, Russia, Indosnesia, ... - (MDT - Member)
Africa
All of continental Africa. We are working on this ... - (Glossary - Unspecified)
Crawling
A condition where fired glaze separates into clump...
In Bound Links
- (Materials - Unspecified)
Light Magnesium Carbonate C2FD - MgCO3
MgCO3
- (Materials - Related)
Talc - Mg3Si4O6 or 3MgO.4SiO2.H2O
Magnesium Silicate, Steatite, French Chalk, Hydrated talc
- (Materials)
Magnesite - MgCO3
Mag Carb, MgCO3, Anhydrous Magnesium Carbonate
- (Oxides - Material source)
MgO - Magnesium Oxide, Magnesia
- (Glossary - Unspecified)
Matte Glaze
A glaze that is not glossy. Of course, unmelted gl...
Pictures
Light magnesium carbonate in a low temperature terra cotta white glaze induces crawling
XML for Import into INSIGHT
<?xml version="1.0" encoding="UTF-8"?>
<material name="Light Magnesium Carbonate" descrip="" searchkey="Hydrated Magnesium Carbonate Mineral, Hydromagnesite, Magnesium Carbonate Light" loi="0.00" casnumber="7757-69-9">
<oxides>
<oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="43.090" tolerance=""/>
</oxides>
<volatiles>
<volatile symbol="CO2" name="Carbon Dioxide" percent="37.640" tolerance=""/>
<volatile symbol="H2O" name="Water" percent="19.260" tolerance=""/>
</volatiles>
</material> | 
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