Hard to tell. Could be Tiger Eye cut at an odd angle…Rob
Thanks! Looks a lot more like Cacoxenite than Tiger Eye…Rob
Thanks Rob
Silver Cloud Designs Jewelry
That was Keith Ludemann’s help not mine, I was just thanking him for it…Rob
Resending as apparently my first attempt failed to be posted on orchid…
It’s hard to tell from that pic, but it might be Nellite, from Africa. I believe it’s mined near the Pietersite deposits, and resembles it a little. Blue and gold are common color combinations in Nellite, the gold parts being chatoyant.
But if it is cacoxinite, I’d say cacoxinite in amethyst from Brazil.
Cheers,
- Lorraine
“The arc of the moral universe is long, but it bends toward justice.”
-Theodore Parker
Resending as apparently my first attempt failed to be posted on orchid…
It’s hard to tell from that pic, but it might be Nellite, from Africa. I believe it’s mined near the Pietersite deposits, and resembles it a little. Blue and gold are common color combinations in Nellite, the gold parts being chatoyant.
But if it is cacoxinite, I’d say cacoxinite in amethyst from Brazil.
Cheers,
- Lorraine
“The arc of the moral universe is long, but it bends toward justice.”
-Theodore Parker
Sorry I misunderstood, Rob
Googling images of Cacoxenite in amethyst, I’d say that’s exactly what the poster’s stone is. There are some beautiful cabochons exhibiting exactly those triangular shards of chatoyant “gold” in a purple ground.
Helen Hill
UK
Thank you all for this information. My customers always want to know what the stones are and the Cacoxenite is one I’d never heard of before. Thanks
This is a stone I got today before I read this question. Serendipity I think. It is cacoxenite in amethyst.
go to mindat.org. for mineralogic information
cacoxenite is an uncommon secondary mineral found in pegmatites and hydrothermal iron deposits, and phosphatic magnetite deposits… it’s an Fe3+/Al hydrated phosphate.
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(as an aside, magnetite liquid immiscibility deposits, where magnetite separates out of magma, can host large clear crystals of apatite, due to the high phosphate content)
Nellite/Pietersite is an oxidized amphibole, altered to limonite, embedded in chalcedony.
Tiger’s eye also contains altered amphibole… the blue form is asbestiform sodic amphibole.