It's hard to believe that suppliers of Andesine were ignorant about treatment (s), but now colored stone industry sources are saying that Andesine starts out as near colorless feldspar, and is then heat treated + the red-orange and green andesine we've been seeing over the past few years is the result of heat treatment (shocking!) + if in doubt always consult a reputed gem testing laboratory.
Useful links:
www.jewelrytelevision.com
http://www.youtube.com/watch?v=UKBb_6VUEag
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