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Identity HelpMineral help? Please =)
1st Mar 2012 16:31 UTCMatt Wall
found this at Judkin's Quary, Nuneaton, UK last weekend. I am just wondering what the minerals are. The mixture of minerals (rock) has a pink/cream crust on the top and is very soft, like talc, it can be scratched with a fingernail. The rock also has a clear fluorite looking sample on the edge of it, hopefully seen in the last photo.
Could anyone please name the minerals?
Thanks, it would help me.
Matt =)
1st Mar 2012 16:37 UTCJolyon Ralph Founder
1st Mar 2012 16:57 UTCMatt Wall
Sorry, here they are! =)
Thanks, Matt
1st Mar 2012 22:01 UTCJosé Zendrera 🌟 Manager
1st Mar 2012 22:34 UTCsteven garza
I agree with Jose, that you have a a granitoid rock (probably a piece of pegmetite - a super-sized grained granite) & his 1st 2 IDs; but, I also have a possible ID on the blue-green material. Although you did VERY well, photoing that specimen, there are things that your pics needed to show, that, only on CLOSE inspection (@ 200X zoom; the pics' zoom feature was WAY too much, to use properly - must be close to 400X or more), did I see possible poor cleavage on those sections; I only saw it going in one direction, on all the pieces, so, I'm guessing it only has one cleavage plane. My guess is fluorapatite, probably a mangoan variety. Try using a UV (long or short wave) to see if it has a yellowish or orangish fluorescence; it may also phosphoresce, shortly after the UV light is out (this happens under short wave exposure, only).
Nice find; KOR, dude!
Your friend, Steve
1st Mar 2012 22:59 UTCRonald John Gyllenhammer Expert
> "a pink/cream crust on the top and is very soft, like talc, it can be scratched with a fingernail."
Good advise from Steve and Jose but although the images may look a little like pegmatite, I don't think this locality hosts one. Further, there are not many pegmatite minerals that can be scratched with a fingernail. You should look at the Judkins Quarry photo page http://www.mindat.org/gallery.php?loc=1631 and compare with some of the images posted there. You might conduct some of your own tests to check the hardness of each distinct mineral. You can also check to see if any of the distinct minerals reacts with vinegar. Record your results and let us know if you can. Good luck Matt.
Ron
2nd Mar 2012 00:20 UTCJosé Zendrera 🌟 Manager
After see the link suggested by Ron let me make a second attempt, today I am bold:
orange = barite
gray = calcite
green = sphalerite?
2nd Mar 2012 16:31 UTCMatt Wall
Judkin's Quarry is a granite quarry, it could be barite leached by some other mineral.
Also. the mineral isn't fluorescent or phosphorescent.
Thanks, Matt =)
2nd Mar 2012 16:35 UTCsteven garza
I, too, must agree; I think Jose has nailed it.
Your friend, Steve
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 20, 2024 04:11:07