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LocalitiesLoudville Lead Mines (Manhan Lead-Silver Mine; Southampton Lead Mine; Northampton Lead Mine), Easthampton, Hampshire County, Massachusetts, USA
19th Mar 2012 00:16 UTCSteve Stuart Expert
Any ideas about what they might be. Barite comes to mind as my first guess.
Thanks,
Steve
19th Mar 2012 00:55 UTCDavid Bernstein Expert
19th Mar 2012 01:51 UTCSteve Stuart Expert
19th Mar 2012 01:57 UTCPeter Cristofono
Barite would be my guess. One thing you could check is fluorescence. Cerussite from Manhan has pretty good yellowish fluorescence under LW. Barite from Manhan does not fluoresce.
Peter
19th Mar 2012 02:50 UTCSteve Stuart Expert
Regards,
Steve
20th Mar 2012 02:20 UTCSteve Stuart Expert
There is another image in the Mindat gallery of a Loudville acanthite with some caveats about visual ID only. Also, acanthite is not listed as found at the Loudville Mines. Any later update or mineral list that would allow a sourced addition of acanthite to the Mindat database?
Thanks!
Steve Stuart
20th Mar 2012 21:32 UTCPeter Cristofono
I don't believe I've seen a published report of acanthite at Loudville, but what appears to be acanthite is often noticed by collectors as a post-mine (and even post-collecting) occurrence.
Check out this old Mindat thread for more info:
http://www.mindat.org/forum.php?read,11,42147,42377
Regarding your barite: Your second image is unusual, but I don't know what else it could be.
21st Mar 2012 03:51 UTCPatrick Haynes (2) Expert
24th Mar 2012 17:07 UTCUwe Kolitsch Manager
24th Mar 2012 21:06 UTCJim Robison
Late to the party, and not objecting to barite, but responding to the comment about the funny appearance of the second image. I think there is a hidden optical illusion in this pic. When you look at an image without any well defined horizontal and vertical points of reference, the eye/brain connection sometimes 'assumes' that the image is flat and parallel to the viewing screen. If that were true, then the crystal appears to be a rhombohedron. If you recognise that the cute little zoned crystal is in fact being viewed at an angle from the upper right side and end view, it is probably sloping into and down to the left of the image. With that in mind, it is clear that this is not a rhombohedron but rather a crystal with 90 degree corners. If you live in a two-dimensional world like I do (can't see with my right eye) then this effect is all the more pronounced. Artists using this illusory effect can create some marvelously confusing drawings.
25th Mar 2012 15:46 UTCSteve Stuart Expert
I looked at the second barite again under the microscope and could not find any orientation that resulted visually in right angles for the corners of the zoned tablet. So, my original photo was very close to an orientation normal to the plane of the crystal. The angles are not 90 degrees. I still go with barite.
Regards,
Steve
25th Mar 2012 21:02 UTCJim Robison
Thanks for looking at crystal orientation again. Just goes to show how a perception can be misleading. Nice zoned crystal in any event. I envy those who can use a stereo microscope to see the third dimension. For me its a flat world, with shadows helpful to show depth if they are present. My second lens on the scope is a nice brace for my forehead if I'm not careful. Not good for much else except to hold my small scope camera.
25th Mar 2012 21:50 UTCSteve Stuart Expert
Steve
2nd May 2014 16:37 UTCrocks
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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 25, 2024 17:48:22