Machining Quartz? Practical Machinist
Nov 24, 2015· Possibly, for prototyping, you could use one of the various size and shape quartz lamp bulbs that are now quite inexpensive and common. They are made of fused quartz, not the crystal variety. Quartz crystal is hardness 7 (Mohs scale), but fused quartz is somewhat softer, They both withstand very high temperature.