31. Its architecture is classical and it bears fine decoration such as the porphyry . 32. It occurs in a quartz vein within a diabase-porphyry shear zone. 33. The cornice strip of porphyry contrasts starkly with its big, bright walls. 34. It is porphyry and bronze, dark materials that immediately convey weightiness and sobriety. 35. The most distinguished of his pupils was Porphyry . 36. Porphyry became one of the most able pagan adversaries of Christianity of his day.37. Porphyry also wrote widely on astrology, religion, philosophy, and musical theory.38. A coarse green grey porphyry intrusive can be found to the west of Holt. 39. In the work, Porphyry expressed his shock at the rapid expansion of Christianity. 40. Porphyry argued that Christianity was based on false prophecies that had not yet materialized.