Dolomite – Ceramic Supply Chicago

Dolomite [CaMg(CO3)2] as a ceramic material is a uniform calcium magnesium carbonate. In ceramic glazes it is used as a source of magnesia and calcia. Other than talc, dolomite is the principle source of MgO in high temperature raw glazes. 'Dolomite matte' stoneware glazes, for example, are highly prized for their plea

Dolomite [CaMg(CO3)2] as a ceramic material is a uniform calcium magnesium carbonate. In ceramic glazes it is used as a source of magnesia and calcia. Other than talc, dolomite is the principle source of MgO in high temperature raw glazes. 'Dolomite matte' stoneware glazes, for example, are highly prized for their pleasant 'silky' surface texture. Dolomite by itself is refractory, but when combined with the typical oxides in a glaze (especially boron) it readily enters the melt.

Commercial dolomites are not able to achieve the theoretical 54:46 calcium carbonate:magnesium carbonate ratio, they tend to have less magnesia. It is simple to do an LOI test by firing a specimen of powder in a thin bisqued bowl to confirm the consistency of dolomite shipments. The chemistry shown here is theoretical and many commercial materials approach this with much less than 1% of two or three other oxides (e.g. Al2O3, SiO2).

Dolomite is a carbonate (like whiting) in that it loses considerable weight during firing when it disassociates to form MgO, CaO and CO2, this process being complete by about 900C.

In many circumstances where a raw glaze employs both CaO and MgO, dolomite is an economic alternative to sourcing with a mix of calcium carbonate and talc. However care needs to be taken to obtain a consistent grade since dolomites tend to vary more in mineralogy and can contain iron contamination that can darken the fired glaze. Although calcium carbonate and dolomite are plentiful minerals and grinding plants are located through North America, finding a suitable ceramic grade dolomite that will be consistent and available long term is not as easy as it might seem.

Synthetic substitutes to source MgO and CaO (e.g. frits) are worth considering, especially if glazes are not high temperature. Frits have no loss on ignition (therefore do not generate glaze bubbles) and melt far earlier than mineral sources of MgO and CaO. Using glaze chemistry it is quite easy to adjust a recipe to source MgO from a frit instead of raw materials.

MSI's Eden Dolomite 24 in. x 48 in. porcelain tile features soft dove gray tones with subtle veining and matte finish for an affordable luxury look. This large format rectangular tile is durable, easy to clean, and low maintenance making it an ideal choice for almost any residential or light commercial space. Use Eden Dolomite on floors in high-traffic areas such as kitchens, living rooms, or baths and on walls, countertops, or backsplash for a cohesive aesthetic that wows.

MSI Bianco Dolomite 12 in. x 24 in. Polished Porcelain Floor and Wall Tile (16 Sq. ft./Case )

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Incorporate a touch of style into your space with the MSI's Bianco Dolomite White Polished Porcelain Floor and Wall Tile. A perfect complement to any

Bianco Dolomite 24 in. x 48 in. Polished Porcelain Stone Look Floor and Wall Tile (16 sq. ft./Case)

Dolomite – US Pigment Corporation

MSI Bianco Dolomite Crema Dotty 12.4 in. x 12.4 in. x 10 mm Polished Marble Mosaic Tile (10.7 Sq. ft. / CASE)

Dolomite – Calia Stone Boutique

MSI Bianco Dolomite Crema Dotty 12.4 in. x 12.4 in. x 10 mm Polished Marble Mosaic Tile (10.7 Sq. ft. / CASE)

SP500 LF06 White Seattle Pottery Supply

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