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Feldspar

Feldspars typically contain 5% or more free silica and thus pose similar hazards to quartz. They are employed in large percentages in almost all clay bodies and in most glazes. There are hundreds of different brand names, try to get a quartz content figure from your supplier.


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Related Information

Original container bag of Custer Feldspar


The back of the bag is blank. The warning label on the front mentions feldspar, crystalline silica and mica.

Warnings on back of Covia nepheline syenite bag 2021


It is stated as non-hazardous in accordance with GHS criteria. Although like feldspar in chemistry, mineralogically nepheline syenite powder is a gound igneous rock, it does not contain quartz.

Minspar 200 original container bag - front and back


Links

Materials Feldspar
In ceramics, feldspars are used in glazes and clay bodies. They vitrify stonewares and porcelains. They supply KNaO flux to glazes to help them melt.
Materials Potash Feldspar
Materials Soda Feldspar
Materials Calcium Feldspar
Materials Spodumene
Spodumene is a lithium sourcing feldspar, an alternative to lithium carbonate to supply Li2O to ceramic glazes. Contains up to about 8% Li2O.
Materials Feldspath ICE 10
Materials Pegmatite
Materials Nepheline Syenite A270
Materials Nepheline Syenite
Materials Custer Feldspar
The most common potash feldspar used in ceramics in North America. While having been a standard for many decades its supply appears in doubt in 2024.
Materials Covia Nepheline Syenite
Materials Nepheline Syenite Norwegian
Hazards Quartz Toxicity

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