| 1 | The relationship between preparation processes and leucite purity and crystal size as well as the effect of them on the performace of dental porcelain fused to metal were analysized. | |
| 2 | Crystal twinning patterns in a leucite crystal from volcanic rock, observed in polarized light by Dr. Michael M. Raith of the Steinmann Institut, University of Bonn, Bonn, Germany. (Dr. |
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