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Identity Helpobsidian in New England? Again? Please help identify
9th Nov 2018 03:46 UTCCarl Andersen
9th Nov 2018 04:52 UTCDoug Daniels
9th Nov 2018 05:56 UTCCarl Andersen
9th Nov 2018 06:42 UTCKevin Hean
9th Nov 2018 07:45 UTCCarl Andersen
9th Nov 2018 08:50 UTCKevin Hean
9th Nov 2018 12:13 UTCKeith Compton 🌟 Manager
Fractures (if that's what they are) do not appear to be consistent for obsidian.
9th Nov 2018 13:04 UTCLarry Maltby Expert
Were they found close together? On the bank of the Thunder Bay River in Alpena, Michigan a group of copper artifacts mixed with natural copper specimens was found. It was thought to be the contents of a skin bag that had rotted away.
9th Nov 2018 14:31 UTCCarl Andersen
9th Nov 2018 14:36 UTCCarl Andersen
9th Nov 2018 14:45 UTCCarl Andersen
9th Nov 2018 14:58 UTCBob Harman
It could be something like dark slag glass or similar man made stuff as KEITH and REINER suggest.
It could be dark obsidian (volcanic glass) as you believe and DOUG seemed to agree with. If so, it certainly is not native to Connecticut and might be imported either by accident or part of an old stash as LARRY M suggested.
Or it could be dark microcrystalline quartz, like a chalcedony, chert, flint etc as also suggested.
I favor this last thought as your last photo closeup of the recently fractured surface shows a rougher texture than the usual freshly fractured surface of obsidian which, to me, is usually very smooth and very glassy. Also you sprayed it, darkening its color and making it more lustrous than natural. So, its natural color and texture would be matte, dark gray, as a chert or flint nodule might be.
However, we may not be able to be more definitive than that from your photos. CHEERS.....BOB
9th Nov 2018 16:49 UTCDonald B Peck Expert
9th Nov 2018 17:31 UTCCarl Andersen
9th Nov 2018 17:33 UTCCarl Andersen
9th Nov 2018 17:36 UTCReiner Mielke Expert
9th Nov 2018 23:23 UTCA. M.
10th Nov 2018 16:19 UTCMark Heintzelman 🌟 Expert
10th Nov 2018 17:14 UTCReiner Mielke Expert
10th Nov 2018 18:04 UTCPaul Brandes 🌟 Manager
12th Nov 2018 22:22 UTCEd Clopton 🌟 Expert
13th Nov 2018 14:45 UTCHarold Moritz 🌟 Expert
But there is plenty of glass slag from all sorts of industrial processes, old and modern, and these turn up all the time. The piece in question was not found in-situ, so where it is from originally, who knows.
4th Sep 2021 21:37 UTCPaul Brandes 🌟 Manager
The only known BIF in New England is in Vermont at Diamond Hill. This is also no known BIF on the Avalon Terrain; this is not BIF.
Thread is closed.
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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: May 10, 2024 00:39:25