1. Feldspar; leucite; nepheline and nepheline syenite; fluorspar.

2. 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.

3. 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.

4. Leucite tephrite was derived from the more enriched mantle source with lower degree of partial melting of mantle source than alkaline olivine basalt.

5. Leucite basalt was solidified by secondary magma, which was produced by fractional crystallization of a small amount (14%) of accumulative rock from primitive magma and assimilation of granite(28%).

6. The light - colored minerals of K -rich volcanic rocks in this area are alkaline feldspar, leucite and nepheline.

7. The main rock type of the volcanic rock is trachyandesite with small amounts of trachyte, basaltic-trachyandesite and leucite basaltic-trachyandesite.