Formula: Li2O.Al2O3.4SiO2 or LiAl(Si2O6)
|If this formula is not unified correctly please contact us.|
|DENS - Density (Specific Gravity)||2.60|
|GSPT - Frit Softening Point||1421C M|
The name is from the Greek spodos, meaning burnt to ash. Spodumene is a silicate mineral often referred to as lithium feldspar. Its mineral form is characterized by hard needle-like grains of brilliant white color. It is used in ceramics as a source of lithia.
Lithia is a very powerful flux, especially when used in conjunction with potash and soda feldspars. As one of only a few natural lithium source materials, spodumene is a valuable component in glass and ceramic/enamel glazes (Li2O reduces thermal expansion, melting temperature and viscosity of the glaze melt).
Spodumene is only slightly soluble (in contrast to lithium carbonate). Because spodumene is a natural combination of silica, alumina and lithia it melts better than a chemically equivalent mixture of lithium carbonate, kaolin and silica. Since almost all raw glazes contain kaolin and silica it is normally fairly easy to juggle recipe ingredients in a ceramic chemistry calculation program to introduce spodumene to replace lithium carbonate. Spodumene can also be substituted for part of the feldspar complement in a recipe without disturbing overall chemistry too much (other than substituting Li2O for KNaO).
Some types of spodumene do contribute to the formation of bubbles in the glaze slurry. You can wash spodumene before use to alleviate this issue (mix it well in plenty of hot water, allow to settle overnight, pour off the water the next day and dry it).
Spodumene is a little more readily fusible than petalite since it is higher in lithium.
Spodumene ore: Typically refiners want 6% or more LiO2 content.
This is what happens when some spodumenes are mixed with water. They generate foam and bubbles. This is disruptive in glazes and can be alleviated by washing and drying the powder before use. Or calcining at 500-600F.
Out Bound Links
The hazards of this material in the ceramic industry and process
Undergoes an irreversible phase transition to yield beta-spodumene. This is accompanied by an expansion of ~30% and a decrease in specific gravity fro...
The toxicity of lithium in ceramics is a hotly debated subject, especially with regards to handling raw lithium carbonate, but also with reference to leaching from glazes.
While this is a trade-name of a specific type of ceramic available, the term is also used in a generic sense to refer to porcelain tableware that has an extremely low thermal expansion. While a trade secret of the Corning company, it is well known that oven-to-table ware is produced by controlling t...
In Bound Links
Tanco Spodumene Ore 200 mesh, Tanko Spod
Lith Carb, Li2CO3
Ausi Spodumene, Ausi Spod