Imperator Crassus. Julius Caesar arrives at the House of Crassus and after a brief tussle with Crassus' guards, is welcomed by the man himself. Crassus strikes an alliance with Caesar in order to bring an end to Spartacus' rebellion. He orders Caesar to remain unshaven and the purpose of this is not revealed.
1 Lanthanum oxide additive to tungsten is used in gas tungsten arc welding electrodes, as a substitute for radioactive thorium. 2  Various compounds of lanthanum and other rare-earth elements (oxides, chlorides, etc.) are components of various catalysis, such as petroleum cracking catalysts.
Lanthanum is usually found only in two different kinds of ores. World production of lanthanum oxide in around 12.000 tonnes per year, and currently nown reseves of lanthanum are around 6 million tonnes. The use of lanthanum is still growing, due to the fact that it is suited to produce catalysers and to polish glass.