A recent entry into the sound instrument fold, the quartz singing bowl is used in live performance and meditation modalities. Made from white quartz crystal which has been crushed, heated and spun into a bowl shape, resembling a Himalayan singing bowl. It can be 'hummed' by circling the top outer rim, or tapped gently. More of a novelty, than an actual sacred instrument, however it is easy to play, and can be useful for music therapy applications.
Originally a byproduct of the computer industry to grow computer chips.