I am also looking for some of that Vietnamese transparent "Amazonite".
Or there's the similar mint-green transparent oligoclase from Kenya/Tanzania. AFAIK this is very rare but not too expensive. I have a chunk of rough that shows obvious pleochroism from bluish-green to yellowish green.
The pale green stuff from Tanzania is often sold as sunstone, though much of it has a slightly murky tone to it. I have some pale rough somewhere which I picked out from a cab parcel, waiting to be faceted. Apparently there was some spectacular material from Canada at some point, according to the GIA's documentation of the Gubelin collection:
Though who knows if there was ever more than just the one, he was apparently pretty good at tracking down real rarities.
Holy guacamole! Are you quite sure this is feldspar.
Yes. The base has the typical striations as a result of repeated lamellar twinning. Another pic illustrating this:
I actually bought this specimen about 8 years ago at a mainstream crystal shop in Salisbury. This was something out-of-the-ordinary as I've never seen anything like it for sale since, even at the Kempton Park Rock & Gem shows.
This tucson I picked up a crystal of feldspar (raman scan best matches albite, so likely at least plagioclase rather than k-spar of some sort) with very blue zones. It was mixed into a parcel of Madagascar sanidine. I've seen blue cleavlandite before but never this gemmy or this blue.
I also saw some of the classic 'masai sunstone' priced not that awful
and some light blue oligoclase, priced who knows but given the seller definitely high
I also found my baggie of green facet rough pulled from a parcel of cab-grade Masai sunstone. Small and mostly pale, but worthy.
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