I dont know this particular Aventurine but I do use A LOT of TAGs sparklies Like Heavy Blue Leprechan. Reducing them can cause compatibility issues so I always work them in an oxidizing atmosphere. 300 degrees an hour sounds very fast to me. I will check my program tomorrow and let you know what ramp rate I use when going through the strain point. Also for anything thicker than 1 inch I use a 2.5 hour soak at 1050. This is loosely based on the theoretical tables I have for annealing.
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