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Old 05-30-2018, 10:56 AM
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Pete VanderLaan Pete VanderLaan is offline
The Old Gaffer
 
Join Date: Apr 2002
Location: Chocorua New Hampshire
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Pete VanderLaan is on a distinguished road
Weyl suggests that chalcedonia is actually easier in a phosphate base. If you don't have weyl ( Coloured Glasses 1951, 1954 ) , get it. It's a very though read, particularly compared to Volf but in actuality, Both authors are quite dismissive of silver bearing glasses except in silver staining. It is a real fugitive and despite rigorous control it's going to give you a good deal of heartache for no discernable reasons.
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