|Monthly Tech-Tip |
Alternate Names: Ausi Spodumene, Ausi Spod
Australian spodumenes are considered the whitest in the world.
The material features [Si2O6]3- chains bonded together by lithium and aluminium ions. It is a monoclinic pyroxene in the form of long tabular, prismatic crystals.
Beta-spodumene (formed at 1082C) has a very low coefficient of thermal expansion, about 1 x 10-6/°C for the range 25°C to 1000°C.
Spodumene ceramic grade, used in glazes, is a 200 mesh material. How could the particles be big enough to glisten in the light? This is a micrograph of some of the particles from the 0.6% plus 100 mesh material that I extracted in a particle size distribution test. And 8% is plus 200 mesh. And all that material is flakey like this, millions of tiny mirrors. This also explains why the material becomes airborne so easily and why it is really not good to breathe this stuff in.
Description of material
Spodumene is a lithium sourcing feldspar, an alternative to lithium carbonate to supply Li2O to ceramic glazes. Contains up to about 8% Li2O.
CGS 3.1 Spodumene
SC 1.1 Spodumene
SC 1.2 Spodumene
FSC 2.1 Spodumene
The most common source of fluxes for high and medium temperature glazes and bodies.
|Frit Softening Point||1420C|
|Density (Specific Gravity)||3.2|
|By Tony Hansen|
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