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Christopher O'Neill's Home Page

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O'Neill Mindat Home Page

Registered member since 19th May 2006

Christopher O'Neill has uploaded:
2936 Mineral Photos
33 Locality Photos
495 Other Photos
About Us: My father, William O’Neill and I have been collecting world-wide minerals since the mid 1960's and thanks to MINDAT.ORG, now have the opportunity to visually share our collection. Although many of the specimens were purchases, a number of them were collected throughout the years at places like the Sparta and Franklin area mines, the lead mines along the Shawangunk Ridge, Salsigne gold mine in Aude, France and recently some islands in the Greek Cyclades, as well as many other lesser known locations, quarries, and road cuts. We wanted to display our collection on this site as a visual reference and may attempt to display several different angles and close-ups, as well as additional photos of associated minerals and even labels accompanying some of the older specimens which may have some historical significance.

Photography: Now using a Cannon S5 SI and a third party clip-on lens for some of the extreme close-ups with just a single white light source. Most of the photos are adequate in attempting to display particular characteristics of the specimen. A few came out surprisingly well but some are still difficult to photograph.

Fluorescence: I'm using a UVP model 38 (8 watts) which is able to produce short, mid and long wave. I've come across a number of species which either react stronger, uniquely or only in mid-wave ultra violet light.

Radioactivity: We are using a Ludlum Model 3 with a 44-9 pancake probe. I use CPM as the measurement unit because it's what most people are familiar with. The probe is usually placed as close as possible to the specimen (or in some cases if the specimen is too small, I'll set it on the probe) as I know of no distance standard (or any standards) used for radioactive measurement with various Geiger counters.

Please feel free to contact me with any questions or corrections.

Enjoy and thanks for looking,
Christopher O’Neill

Messaging Statistics

Total messages posted:125
New threads started:26
First message posted:19th May 2006
Latest message posted:7th Sep 2019

My Latest Discussions and Replies

8wSleepy Cat Mining DistrictPosted by Serge Lavarde. 6 replies in General.Feb 2019Re:UV lights - what is best?Posted by Jasun D. McAvoy. 17 replies in General.Nov 2018Kolwezite - Kolwezi, Kolwezi District, Katanga, Democratic Republic of the CongoPosted by Peter Chin. 7 replies in Photos.Jul 2018Cerite var. RESSINGITE - has anyone heard of this??Posted by Christopher O'Neill. 7 replies in Identity Help.Sep 2017Britholite - Kyshtym, Urals Region, RussiaPosted by Christopher O'Neill. 8 replies in General.Sep 2017Name that Collector....Posted by Christopher O'Neill. 2 replies in General.Jul 2017California, USAPosted by Chester S. Lemanski, Jr.. 221 replies in Localities.Oct 2016Margarosanite - Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USAPosted by Peter Chin. 5 replies in Photos.Sep 2016Pennsylvania Mine location helpPosted by Christopher O'Neill. 10 replies in General.Sep 2016LIkely not thorianite - Easton, PAPosted by Jeff Weissman. 3 replies in Improving 2016Jarosite or Hydroniumjarosite ????Posted by Christopher O'Neill. 5 replies in Identity Help.May 2016Metakirchheimerite - Schmiedestollen dump, Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, GermanyPosted by Carsten Slotta. 5 replies in Photos.Apr 2016Magnesite - Mount Brussilof mine, Radium Hot Springs, Golden Mining Division, British Columbia, CanadaPosted by Richard Gunter. 8 replies in Photos.Dec 2015Fabricated provenancePosted by Dave Owen. 32 replies in Fakes & Frauds.Oct 2015Can new locality be added for Laird Island Tazan Lk?Posted by Christopher O'Neill. 7 replies in General.Sep 2015Canada Experts (eh?) - Phlogopite, QuebecPosted by Christopher O'Neill. 7 replies in Identity Help.Mar 2015Harstigen Mine - Caryopilite?Posted by Christopher O'Neill. 9 replies in Identity Help.Jan 2015Newly submitted pictures (not approved yet) no longer visiblePosted by Holger Klapproth. 29 replies in Improving 2015Selection; oldest or newest first,gives a reaction what's oppositPosted by Ko Jansen. One reply in Improving 2015Any younger users like myself?Posted by George deWit Chaney. 18 replies in General.

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