Borosilcate won't hold up to the fast heating/cooling cycles. If its anything other than the banger /bucket whatever you call it, its most likley not quartz.
Grab a piece of quartz, put it in your glass torches flame. The bright blinding linght, and the fact that its stiffer than.... Jimmy the Don... you will start to understand its a necesity , and a inconvience to work in most situations.
My carlisle centerfire on propane did ok to shape a quartz nail. It was not fun by any means. Prehaps hydrogen is the ticket, but i bet it gets stiff quick out of the flame.
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