- Weak coloring oxide
- Melts at 1710°F
- One of lanthanide oxides
- Classified in periodic table as rare earth oxide
- Not used extensively in ceramics but used in yellow stains with zirconium silicate
- Oxide is slightly soluble in water
- Very toxic
- Can be obtained as oxide
- Usually introduced into glaze recipe in form of commercial stain like Mason 6433, 6405, or 6407.