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GeneralHelp with modified fluorite from Spain
21st Sep 2014 04:57 UTCJuan Fernandez Buelga
I'm not sure if this is the correct section for this topic.
I would like to know if anyone has seen this type of dodecahedral modification before. Looks like a normal fluorite cube very slightly modified by the dodecahedron, but on one of its corners it presents a very well developed "dodecahedral modification" plus many fine lines on each side. I've never seen something similar before. The rarely modified crystal is around 1cm and the specimen is around 3cm.From La Viesca Mine, Asturias, Spain.
I would love to see similar modified fluorites.
Thanks in advance for you help!
Juan Fernandez Buelga
21st Sep 2014 09:09 UTCErik Vercammen Expert
21st Sep 2014 19:37 UTCNik Nikiforou
29th Sep 2014 07:47 UTCJuan Fernandez Buelga
Thanks Erik for your interesting input.
30th Sep 2014 05:11 UTCBob Jackson 🌟 Expert
Identical patterns are very common on Navajun and Spruce pyrite cubes, and I suspect many other isometric minerals.
Bob
5th Oct 2014 03:42 UTCJuan Fernandez Buelga
I have just photographed a fluorite specimen from Berbes which shows the lines you are talking about (it is very common to see them in broken specimens). It is not the best example to show these lines, but I will try to post better examples when I can.
Bob: As you say they are similar, but it is not the same case. Crystals don't need to separate during growth to form these lines, you can just grab an specimen with several fluorite crystals, break apart the specimen where two crystals join and you will find them quite easily. Those lines are created during crystal growth.
As you can see they are not like the ones you can see in the first photo I posted. Moreover you can not find the dodecahedral faces anywhere.
5th Oct 2014 13:04 UTCOwen Melfyn Lewis
You have a modifed fluorite.
Here's mine, albeit very small, as an inclusion in a cabbed topaz.
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