What is the difference between the sound of a metal bowl and a quartz bowl?
A metal bowl is played with a wooden stick pressed against the side. Unless you have an exceptional bowl it will not continue to resonate as long as a quartz bowl. The metal bowl plays several notes at one time, the quartz bowl plays only one. The metal bowl has a subtle sound that is appreciated more when the bowl is held to the ear whereas the quartz bowl is loud and can be heard quite well from a distance.