SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Identity HelpConcretion with Pyrite?

13th Oct 2019 00:48 UTCSteve Federico

03571240015709240175958.jpg
Dear Sirs,this is a rock found in northwest Ohio,USA at a spot with lots of glacial erratics but it might be a little closer to home than Canada.I think it is a weathered piece of a concretion with lots of pyrite.What I know:
 color:gold,rusty metallic
streak:black tested on many differant places
hardness:at least 5.5 tested in multi places with new glass plate leaving scratch
magnet has no reaction anywhere
after light clean 24 hours in clr did nothing to clean it no reaction
I hope the photos are ok I have trouble with them all the time Sorry.I look forward to any replies........Thanks,Steve

13th Oct 2019 00:52 UTCSteve Federico

07305050015709241865589.jpg
the top I forgot to say rock is about 3x3 inches 1.5 thick and very heavy for its size

13th Oct 2019 00:53 UTCSteve Federico

02317610015709243706395.jpg
the back of it

13th Oct 2019 00:54 UTCSteve Federico

07509880015709244374519.jpg
a side view

13th Oct 2019 00:58 UTCSteve Federico

08500200015709245266674.jpg
another side view.Gibsonburg Ohio is place found.Thank you again for any Help....Steve

13th Oct 2019 01:30 UTCBob Harman

Gibsonburg Ohio is in the Findlay Arch region of Northwest Ohio. It is a sedimentary environment so I think your example is an iron concretion or a very corroded pyrite nodule.

Parenthetically some fabulous iridescent fluorites came from the now extinct locality of the Gibsonburg Quarry.     CHEERS....BOB

13th Oct 2019 02:04 UTCPaul Brandes Manager

Appears like an odd iron concretion to me as well...

13th Oct 2019 03:46 UTCDean Allum Expert

Steve,
Several aspects of it remind me of a pyrite/hematite concretion. With a microscope or magnifying glass, inspect the rough areas or vugs for tell-tale cubic habit pyrite crystals, now with a coating of hematite.

These are often associated with calcite.

If it is local, you may be able to find others which have weathered from the limestone matrix by looking for telltale rust staining.
-Dean

13th Oct 2019 16:18 UTCSteve Federico

Thank You for the replies.Dean a 10x loupe shows tons of tiny cube shapes some bright gold and many have a dark grey metallic dull coating.I should say I have found many pyrite nodules etc. in my area and none compare in weight with how heavy this rock is.Thank You......Steve
 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: November 19, 2019 18:18:51
Go to top of page