A quick, on the spot test to identify a jade possibility is to try to scratch the stone with a scriber.
The usual jade substitutes will scratch, jade will not.
It is a possibility test only, but it has saved me an error or two in the past.
Going back a few years I used to sell gemstones to jewellers and lapidiarists in Central Jawa and Bali. Apart from opals and sapphires, the most popular stone I sold to them was good quality chrysoprase. I sold this as rough, and it was marketed as "Hong Kong Jade".
The recent glass look-a-likes are really a trap, in a market setting, they are virtually indistinguishable from the real thing.
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